A concept analysis of nurses in conflicts after World War II

Abstract Aim We analysed nurses' experiences during military conflicts since World War II. Background Nurses have successfully reduced morbidity and mortality in populations affected by wars; despite centuries of nurses' global involvement in wars, there is limited knowledge about their experiences. Method We used Rodger's evolutionary concept analysis methodology to understand the antecedents, attributes, consequences, context and implications of nurses' war‐related experiences. We analysed data from quantitative and qualitative research, media reports, editorials, historical reviews and published accounts of nurses' experiences in many locations, including Afghanistan, Bosnia, Croatia, Korea, Kosovo, Iran, Iraq, Israel, Palestine, Russia, Somalia, Ukraine and Vietnam. Findings Two antecedent conditions preceded nurses' war involvement: actively responding to human suffering and having resources for readiness. Nurses were defined by five attributes: sacrifice, resourcefulness, tunnel‐vision, survival mindset and comradery. We also found evidence for seven consequences; nurses saved lives (reduced morbidity and mortality), however, some nurses faced professional burnout/disillusionment, restricted practice authority, isolation and post‐traumatic stress after war. In addition, growth and pacifism were consequences for some nurses who were exposed to war. Conclusion The findings of our concept analysis illustrate how nurses have fulfilled critical life‐saving roles, but some nurses' post‐war experiences were debilitating, stigmatized and unsupported. We conclude that research about the resourcefulness, innovations and resiliency nurses have developed during wars is essential, and professional support mechanisms must be developed to prevent post‐traumatic stress, burnout and attrition from the profession. Governments can use utilize the knowledge nurses developed during wars to expand emergency preparedness skillsets and promote nurses as the leaders of international efforts to promote peace. No Patient or Public Contribution Patients, service users, caregivers and members of the public were not involved in conducting this concept analysis or preparing the manuscript. Impact statement By understanding nurses' involvement with post‐WWII conflicts, we have demonstrated the significant public health contributions, challenges and personal and professional growth experienced by nurses. Nurses' war‐related knowledge should be utilized to innovate healthcare practices during disasters and to advise policymakers in developing, implementing and evaluating peace‐promoting operations.


| INTRODUC TI ON
Wars-armed conflicts among governments or paramilitary groups-cause tremendous suffering, death and destruction. War was defined by Griffiths and Jasper (2008) as the "antithesis of health," physically, psychologically and economically. Nurses have cared for war-afflicted populations by providing emergency care, supporting humanitarian missions and implementing measures to prevent infectious and food/water-borne illnesses (Keeling & Wall, 2015). The boundaries of nursing knowledge, practice and authority have been pushed forward by the challenges that are inherent in wars and disasters (Milbrath, 2019). Wars have also shaped the nursing profession's norms, achievements, and histories, over centuries, and around the world (Milbrath, 2019).
Despite nurses' impactful efforts in supporting the health of civilians and combatants, most research endeavours about wars have overlooked nurses' experiences.
World War II (WWII) represents a pivotal event in the history of nursing. The utilization of antibiotics, surgical asepsis and blood banking profoundly advanced nursing practice during this era (Milbrath, 2019). Nursing degree programmes were established in universities around the world after WWII (Hazrati et al., 2011).
Nurses' professional opportunities in the armed forces also expanded after WWII, particularly in the United States (U.S.) and United Kingdom (U.K.). Notably, a more diverse workforce was employed, and nurses could join the armed forces and receive military ranks, benefits, promotions and training (Milbrath, 2019). Before WWII, for example, American nurses were contractors employed by the military to care for wounded and ill soldiers. When the U.S. Army and Navy Nurse Corps were established at the turn of the 20th century, the Nurse Corps remained siloed from the rest of the medical department, which withheld military training from nurses. The nurse was only provided with relative military ranks and limited opportunities for advancement. Significantly, only white women were permitted to join the Nurse Corps before and during WWII-men and women of colour were barred from serving, with rare exceptions (Milbrath, 2019). Considering how the nursing workforce changed, and nurses became more autonomous and educated after WWII, the purpose of the present paper was to analyse nurses' war-related experiences only during the post-WWII era.

| Design and data collection
Concept analyses, according to Rodgers (2000), are inductive knowledge-building exercises that must be performed before researchers can develop hypotheses, measures or interventions for future studies. Rodger's concept analysis methodology provides a systematic approach for defining a concept and its contextual factors. Rodgers encouraged investigators to analyse data from many different types of source material (e.g., research, news, literature or art), and she recommended obtaining at least 30 records to conduct a valid assessment. Consistent with these instructions, we designed a search strategy that would provide us with a combination of scientific literature, personal accounts and media reports. We conducted the literature search in April 2022. We used a purposive sampling method, similar to Ames et al. (2019), to collect a variety of articles about nurses' war-related experiences that would reflect data from different perspectives, locations, nationalities and post-WWII time periods. As shown in Figure 1, we used the terms "nurses and war" to search multiple databases: the Cumulative Index to Nursing and Allied Health Literature (CINAHL) and MEDLINE (via PubMed) and PsycINFO. We also entered "nurses and war" into Google where we selected eight news articles, two letters, one newsletter and one research paper. Using these databases, we selected 50 articles that reflected nurses' experiences with wars and conflicts, globally. To be included in the analysis, papers were required to report the experiences of nurses who were deployed or living in areas impacted by war. We included papers about Military Operations Other Than War (MOOTW), defined as humanitarian missions and military activities designed to deter impending wars, as long as the nurses were engaged with frequent mass casualty events in regions experiencing sustained violence (e.g., Operation Restore Hope in Somalia). We excluded depictions Impact statement: • By understanding nurses' involvement with post-WWII conflicts, we have demonstrated the significant public health contributions, challenges and personal and professional growth experienced by nurses.
• Nurses' war-related knowledge should be utilized to innovate healthcare practices during disasters and to advise policymakers in developing, implementing and evaluating peace-promoting operations.

K E Y W O R D S
concept analysis, deployment, emergency nursing, military, nurses' roles, peace, post-traumatic stress, war of nurses from fictional literature or from sources designed for entertainment (e.g., M*A*S*H, China Beach) because fictional characters may not reflect nurses' factual experiences and characteristics. In the present paper, we use the terms "war" and "conflict" interchangeably.

| Data analysis
To analyse the articles, we read each paper twice while compiling a list of the common themes. After this reading phase, the themes were categorized as antecedents (pre-existing conditions), attributes (clusters of conceptual definitions), or consequences (outcomes), which collectively described nurses' experiences with war ( Table 2).
We adhered to Rodgers' (2000) definition of concepts-she argued that concepts "are formed by the identification of characteristics common to a phenomenon" (p. 78).
Rodgers also emphasized the importance of considering a concept's "contextual basis." The contextual basis refers to the "temporal" and "sociocultural variations" of concepts (p. 85). Temporal variations consider the impact of time (referring to the conceptual antecedents and consequences) but also illustrate Rodgers' view that conceptual definitions often evolve over time (p. 85). Sociocultural variations explain how cultures, religions and nationalities may influence the definitions of a concept in different situations. To address these aspects of Rodgers' methodology, we reported the characteristics of nurses in each study (Table 1), such as their locations, nationalities, religions, genders, employment and education (when these data were available); this information was evaluated to determine whether the times, locations or nurses' characteristics altered any conceptual attributes.

| Antecedents
An Iranian nurse said "I was always present on the front, and voluntarily so, because I felt the urge to help. The only reason for my presence there and for tolerating the extreme war conditions was love… there were people who didn't have to be there, who could have simply stayed in their own cities, but they were there serving anyways" (Rahimaghaee et al., 2016). Another nurse who joined the U.S. military described being inspired by a compassionate surgeon's character on the popular American television show M*A*S*H, which led him to value "talented healthcare providers" who could "save" people (Collins, 2008).

| Resources/Readiness
There were no reported cases of nurses working alone; they were always a part of teams supported by existing institutions (e.g., hospitals and military units). Nurses who were educated, trained and licensed to work in nursing were available and ready to support healthcare/humanitarian missions. Nurses who were military officers often had advanced practice degrees (Table 1), and they could lead interdisciplinary teams, practice autonomously and accept a high degree of responsibility (Blaz et al., 2013;Collins, 2008;Griffiths & Jasper, 2008;Lewis et al., 2016).

| Sacrifice
Nurses made sacrifices in their roles to protect patients. They expected themselves to be prepared for "self-sacrifice and selfless service" (Yoder & Brunken, 2003), and they described being proud of their commitment and patriotism (Agazio, 2010;Firouzkouhi et al., 2013;Kenward & Kenward, 2015;Scannell-Desch, 1996;West & Clark, 1995). An Iranian nurse explained "under the influence of the soldiers' self-sacrifice, I was also sacrificing myself.
This spirit seemed to dominate everyone everywhere at that time" (Rahimaghaee et al., 2016).
Nurses faced uncertainty and danger as they worked long, unpredictable schedules. One described 'living in a twilight zone" because they were "permanently on-call" (Kenward & Kenward, 2015). When patients required urgent surgeries and transfusions, nurses who had the same blood types quickly donated their blood (Agazio, 2010;Kenward & Kenward, 2015;Weedall, 2017). White (2009)

| Tunnel-vision
Nurses worked with intense and focused attention; they followed their instincts, ignored the surrounding dangers and eliminated unnecessary distractions (Kenward & Kenward, 2015;Ma et al., 2021;Scannell-Desch, 1996). They acknowledged experiencing anxiety and sadness but diverted attention towards their immediate tasks.
White (2009)  Kabul. Tunnel-vision allowed nurses to make decisions rapidly and to function under suboptimal conditions, but it did not hinder their abilities to be compassionate and empathetic (Finnegan et al., 2016;Griffiths & Jasper, 2008;White, 2009). A Washington Post article quoted a former U.S. Army nurse saying "you just wanted to cry, but we also had a job to do" when describing her role in Operation Baby Lift, a mission that evacuated children from Vietnam in 1975 (Rosenwald, 2021). Another American nurse who served in Vietnam explained that she "never thought about the danger until it was all over." She described the evacuation planes returning with "holes in them; we would land, and you could see some of the fire in certain areas, but you just didn't dwell on it" (Scannell-Desch, 1996).
Nurses who cared for enemy combatants described their ability to ignore their underlying cultural and political differences, which prevented distractions from providing high-quality nurs-

| Comradery
Nurses relied on each other. They focused on their roles within teams instead of their individual selves (Conlon et al., 2019;Kenward & Kenward, 2015;Ma et al., 2021;Rahimaghaee et al., 2016;Scannell-Desch, 1996;Yoder & Brunken, 2003). Experienced nurses viewed themselves as mentors who had responsibilities to fulfil in supporting novice nurses (Conlon et al., 2019;Ravella, 1995). An American nurse interviewed by Yoder and Brunken (2003) explained that "you are only somebody because of the person next to you. A chain is only as strong as its weakest link." Nurses from the U.K. explained that their self-worth was "aligned to strong team integration" while they were working in Afghanistan (Finnegan et al., 2016). Socializing was important-American nurses described "bonding" in Vietnam and having a "closeness different than any other relationship" (Scannell-Desch, 1996). A British nurse explained that "from a team dynamics perspective it is important to see each other and to be part of each other's lives" (Finnegan et al., 2016).
Maintaining a shared sense of "humour" was a key component of nurses' comradery (Leon et al., 1990; Ravella, 1995;Scannell-Desch, 1996). Joking and laughing with colleagues allowed nurses to collectively cope with fear, anger and distressing events in Vietnam, Somalia and Iraq (DiFilippo, 2017;Scannell-Desch, 1996;Scannell-Desch, 2000;West & Clark, 1995;White, 2009). For American nurses in Korea and Vietnam, "partying" provided a respite from work and an opportunity to build comradery; several accounts described how alcohol was often available in Korea and Vietnam (Bille, 1993;Scannell-Desch, 2000;van Ingen, 2009). Developing close social connections came with psychological risks, however, as illustrated by the recollections of nurses whose colleagues were injured or killed (Bille, 1993;Conlon et al., 2019). An American nurse who worked in a Mobile Army Surgical Hospital in Korea explained how morale was also affected by the leadership qualities of their commanding officers-she explained an instance where poor leadership caused low morale, which she suspected led to two suicides during her deployment (van Ingen, 2009).
Nurses were especially skilled in preventing deaths from haemorrhage, coagulopathy, acidosis, hypothermia and compartment syndrome, which commonly and concurrently resulted from battlefield traumas (Byers, 2010;Lancaster & Williams, 2010;Peoples et al., 2005). Nurses provided training for local medical services (Lancaster & Williams, 2010;Lewis et al., 2016), such as teaching chest tube insertion and aseptic dressing change procedures to the Afghan National Army and Police; data about local hospital outcomes indicated that this education led to a 45% reduction in their morbidity rates (Lancaster & Williams, 2010). According to Lewis et al. (2016), eight nurse practitioners fulfilled vital roles in the Troop Medical Clinic at Camp Victory Kuwait where they treated an estimated 1956 service members within 1 month for a variety of illnesses and injuries. Nurses were also skilled in managing patients who were suffering from sleep deprivation, depression and acute anxiety (Moore, 2005). According to Peterson et al. (2008), nurses' skills for assessing and managing psychiatric conditions were particularly important during Operation Iraqi Freedom because large numbers of soldiers sustained brain and mutilating injuries caused by improvised explosive devices. Ravella (1995)  For an American nurse who worked in a field hospital in Vietnam "chaos felt normal," and he struggled with reintegrating into the nursing workforce where there was a much slower pace in the workplace activities (Billie, 1993). Some nurses found it difficult to care for patients who did not have severe injuries because their complaints seemed trivial compared with their wartime patient experiences (Doherty & Scannell-Desch, 2015;Elliott, 2015;Norman, 1992).
Nurses also found it difficult to get along with coworkers when they returned to nursing jobs in the U.S. because the day-to-day problems that arose were relatively insignificant, leading them to experience anger and resentment (Doherty & Scannell-Desch, 2015).
An study conducted by Berger and Gelkopf (2011) demonstrated that educational interventions may reduce burnout in nurses who work in areas frequently impacted by war. They tested a 12-week programme that provided nurses with education about stress, trauma and resiliency; participation in this programme was associated with significantly decreased burnout, decreased compassion fatigue and increased professional self-efficacy. Using a feminist perspective, Norman (1992) analysed the post-war experiences of female Vietnam veterans and concluded that "anger and bewilderment" arose when the women experienced a "loss of status." According to Norman, women had demonstrated "how they could adapt to the stress of war," and they were frustrated about being "forced back" into traditional, subservient roles for women when they returned home.

| Restricted practice authority
During war, nurses practiced with the full extent of their knowledge and abilities, but they returned to jobs where they had significantly restricted practice authority. Some nurses "questioned their professional worth" (Norman, 1992). A nurse who worked in Vietnam explained feeling "useless" when she returned to a civilian nursing setting due to the laws preventing nurses from practices that had been routine for them during deployment, such as giving blood transfusions (DiFilippo, 2017)-this experience was consistent with the reflections of other American nurses who had been in Vietnam; they felt "devalued" and "underappreciated" (Scannell-Desch, 1996) and "disillusioned" (Norman, 1992) when they began working as nurses in stateside hospitals. A nurse from the 24th Evacuation Hospital in Long Bình explained that her wartime experience "spoiled me for nursing because I did so much there that I couldn't do in a military hospital in the states; suddenly you weren't allowed to do anything" (Norman, 1992). Nurses in Iran also undertook an augmented scope of practice during war; due to a shortage of physicians, civilian Iranian nurses performed procedures (such as intubations) that were not normally within their scope of practice (Firouzkouhi et al., 2013).

| Isolation
Nurses' post-war experiences illustrated social isolation (Bille, 1993;Conlon et al., 2019;DiFilippo, 2017;Doherty & Scannell-Desch, 2015;Elliott, 2015;Livingston & Rankin, 1986;Scannell-Desch, 1996;Wild, 2003). Sometimes, they felt ostracized (Bille, 1993), and other times, they wanted time alone (Ma et al., 2021;Scannell-Desch, 1996). Nurses described choosing not to share their war experiences with others, and this theme was especially in prominent among American nurses who were in Vietnam. For example, a female nurse explained how her Vietnam war experience became "a hidden part of [her] history" because women were not viewed by society as veterans (DiFilippo, 2017). A male Vietnam veteran did not share his experiences because, upon returning home, he was met with "insults or nothing;" therefore, his war experiences became a "secret" (Bille, 1993). A nurse from the 12th Evacuation Hospital in Củ Chi explained that she "didn't tell anyone [she] was a veteran, let alone a Vietnam veteran; I just packed all that up, stuffed it in a box and put it virtually away" (DiFilippo, 2017). Livingston and Rankin (1986) believed that nurses returning from Vietnam were expected to be "quiet and brave; [they were] not supposed to speak about" the war.
Scannell-Desch and Doherty (2013) studied families to understand the experiences of nurses who were parents; these nurses reported anxiety about child-care arrangements during their deployments and fears that their prolonged absence would adversely affect their families. An American nurse in this study explained that the "separation from my kids was the biggest price I paid in this war." American nurses also explained how they were "not emotionally ready to face their families" upon returning from Vietnam (Scannell-Desch, 1996). A nurse found it "difficult to fit back into the fabric of [his] family" when he returned to the U.S. from the Middle East (Elliott, 2015), and another nurse's family "could tell he was a changed person. It was the elephant in the room. [They] pretended like nothing had happened" (Doherty & Scannell-Desch, 2015). Suddenly away from the comradery they developed during war, veterans may have been longing for the "idealized family" that had been comprised of their wartime colleagues, according to Wild (2003). Australian military nurses reported finding it difficult to communicate their wartime nursing stories to people who did not have the same experiences (Conlon et al., 2019), and others described losing friends who could no longer relate to them (Elliott, 2015).

| Post-traumatic stress
Some of the nurses suffered from post-traumatic stress, and they ruminated about memories of war (Bille, 1993;Brunk, 1997;Doherty & Scannell-Desch, 2015;Livingston & Rankin, 1986;Ma et al., 2021;Ravella, 1995;Wild, 2003). There were also reports from nurses about feeling "hyper-vigilant" and unable to sleep (Doherty & Scannell-Desch, 2015;Elliott, 2015). According to Brunk (1997), nurses' expectations to be nurturing and caring "in the face of war's devastation and carnage" could compound the stress of wartime nursing. Livingston and Rankin (1986) argued that female veterans may have silently suffered from post-traumatic stress because the U.S. military has "a long history of denying that women" have roles during war; their feminist analysis of American war involvement concluded that the experiences of female veterans have been "invalided" by the myth that women cannot experience war the way men do-women had "nothing to do with the 'real' thing," they argued, but in reality, they had up-close knowledge of the "death and destruction" (Livingston & Rankin, 1986).
Some American military nurses were hesitant to seek mental health services because they feared how the associated stigma might affect their career options and promotions (Doherty & Scannell-Desch, 2015). Several former/retired military nurses described how traumatic flashbacks occurred when they witnessed news stories that were similar to their wartime experiences (Bille, 1993;DiFilippo, 2017;Rosenwald, 2021). For example, they vividly remembered soldiers who had died under their care, and they felt guilt (Bille, 1993;Leon et al., 1990;Livingston & Rankin, 1986). An American nurse who worked in the 46th Combat Support Hospital described thinking about the families of soldiers who died in Mogadishu; she "wanted them to know how hard we tried to save their lives, and how we wish we could change the past" (Yoder & Brunken, 2003). An Iranian nurse described war as an "atmosphere in which nurses would pay spiritual and emotional costs" (Rahimaghaee et al., 2016). A feeling of "numbness" was also reported by nurses when they returned home (Bille, 1993;Elliott, 2015;Scannell-Desch, 1996). An American nurse described feeling "completely numb and empty, like I was looking out of a mask" (Elliott, 2015). Some of the nurses used alcohol to cope (Bille, 1993;Doherty et al., 2020;Livingston & Rankin, 1986;Scannell-Desch, 1996;Scannell-Desch, 2000;Wild, 2003).
To understand the characteristics of post-traumatic stress symptoms among Israeli nurses, Ben-Ezra et al. (2013) obtained survey data about the effects of the Gaza War. They compared questionnaire scores obtained during the war to scores determined 6 months later in nurses who were exposed versus were not exposed to war.
During the Gaza War, the exposed nurses had significantly higher scores for post-traumatic stress (Impact of Event Scale), depressive symptoms (Center for Epidemiologic Studies Depression Scale), and psychosomatic symptoms (Psychosomatic Problems Scale) compared with nurses who were not exposed to war. By 6 months, however, only the psychosomatic symptom scores remained significantly higher in the exposed group, indicating that these symptoms (such as headaches, stomach aches and sleeplessness) persisted.
Ben-Ezra et al. (2013) concluded that future longitudinal studies should examine the time-course of nurses' health issues after war to determine the optimal timing for interventions. In a study of Palestinian nurses affected by the Gaza War, Shamia et al. (2015) found that 64% of the nurses reported being traumatized by events occurring in their communities, such as witnessing tanks demolishing their neighbours' homes, illustrating how nurses who are residents of war zones suffer simultaneously from work-related and community-related traumas and may therefore require additional interventions to cope with their experiences.
American nurses described how they eventually "embraced a new normal" after they returned from Vietnam because they "felt forever changed by war." Doherty et al. (2020) studied American military nurses who served in the Middle East and found that although the nurses reported challenges re-integrating into civilian life, they experienced "post-traumatic growth," which was defined as a "positive psychological change [resulting from] highly challenging life circumstances." Nurses in this study reported becoming "more compassionate," developing "personal strength," and having "a greater appreciation for life." These qualitative results were corroborated by these nurses' post-deployment scores on questionnaires, such as the Core Beliefs Inventory and the Posttraumatic Growth Inventory (Doherty et al., 2020). A qualitative study by Elliott (2015) provided similar results; an American nurse described growing and "looking at life through a new lens," and deployment was defined as "the ultimate experience" despite "so much terrible stuff that happened." A British nurse who served in Afghanistan reflected that "having that experience, gaining that extra knowledge and toughing it out through the tour makes people grow" (Finnegan et al., 2016).

| Pacifism
Personal and professional experiences led some nurses to speak out against wars (Boyle & Bunting, 1998;Crowe & Hardill, 1991;Ford, 2022;Gorman, 2004;Tschudin & Schmitz, 2003). Russian nurses recently published a letter opposing war in Ukraine, recounting the loss of "priceless" human lives (Ford, 2022). In the U.S., nurses wrote about the horrors of war that have been faced by civilian populations (Boyle & Bunting, 1998) and by young soldiers and their families (Gorman, 2004)-these nurses called for the profession to focus on pacificism and peace-keeping and to organize politically to protest wars and protect human rights (Boyle & Bunting, 1998;Gorman, 2004). Canadian nurses, Crowe and Hardill (1991), argued that "health is political," and they were critical of the way military customs had influenced the nursing profession with "starched uniforms" and "pins signifying rank" while nurses remained "silent on social and political issues." Livingston and Rankin (1986) defined war as a component of a "patriarchal social structure" where violence is used to "dominate and control," and combatants "resolve to win, not to resolve conflicts." Nurses' stories, they argued, "reveal so much about the nature of war." They saw nurses being forced into a "paradoxical position" because they were "used for [winning] wars" but subsequently became "marginalized and devalued." Having nurses "patch up the bodies" perpetuated a myth that war was "not about killing people," they argued (Livingston & Rankin, 1986). Nurses' ethical concerns about sending the "recovered soldiers back to [the] battle" was also a theme that emerged in interviews conducted by Scannell-Desch (1996). Tschudin and Schmitz (2003) described an ethical duty for nurses in preventing wars, meaning that they must be well-informed about international events (specifically the hardships faced by refugees) and recognize the profession's "political responsibility." Boyle and Bunting (1998) also focused on nurses' roles in war-prevention; they wanted the profession to become more comfortable talking openly about war and not to "turn away."

| Contextual basis: Temporal and sociocultural variations
According to Rodgers, concepts are evolutionary, meaning that their definitions can vary over time. Across all of the post-WWII conflicts that we studied, we found that nurses consistently responded to human suffering and relied on existing resources to support their wartime involvement (i.e., military units and hospitals). Consistent conceptual attributes were also identified across studies (i.e., sacrifice, resourcefulness, tunnel-vision, survival mindset and comradery). Similar consequences were identified over time and across locations (i.e., reduced morbidity and mortality; a risk for isolation and post-traumatic stress; possible growth and pacifism) although the professional disillusionment experienced after war may have been the most prominent in the stories told by American Vietnam War veterans. To understand potential sociocultural variations in the concept, we analysed papers about different types of nurses, nationalities and conflicts (e.g., reports from civilians, military officers, volunteers and nurses who experienced attacks on their own communities). We found that nurse from different backgrounds confirmed our definitions of the conceptual antecedents, attributes and antecedents reported in the present paper.

| DISCUSS ION
Rodgers' concept analysis methodology was used to determine the ubiquitous/universal attributes of a concept (nurses in conflicts after WWII)-we analysed data over a vast but pertinent timespan (because pivotal professional changes occurred after WWII), and we studied diverse perspectives about wars, which supported similar conceptual definitions. We concluded that nurses' experiences with wars are defined by sacrifice, resourcefulness, tunnel-vision, survival mindset and comradery. When wars occurred, nurses were driven to respond to human suffering and their involvement was supported by existing resources. Nurses' actions saved lives. After war, nurses could experience burnout/ disillusionment, isolation, post-traumatic stress, growth and pacifism.
By defining nurses' war-related experiences, we have synthesized foundational knowledge to inform future research, interventions and policies.
It is important to acknowledge the limitations of paper-we chose not to analyse every available report about nurses' roles after WWII and to instead select a variety of representative papers. This approach could have induced biases, especially because the professional processes for nurses and military operations differ in different countries. For example, the focus on burnout and post-traumatic stress in the American military nurses could be associated with the requirement for longer deployments in the U.S. compared with other countries. We also examined literature from the entire post-WWII era, which carries a risk for an anachronistic interpretation of the older papers (i.e., biased by our modern perspective). Only a few of the articles provided data about the nurses' religious and cultural backgrounds, which limited our ability to identify potential variations in the concept according to nurses' cultures. We only selected English language materials; therefore, our findings may not fully reflect the experiences of nurses around the world. Our electronic search strategy may have missed useful resources that were not archived online, and our design did not permit a quantitative meta-analysis of data across the selected studies.
Our concept analysis has important implications for developing future research programmes, educational and psychosocial support initiatives, and international policies. It will be important for researchers to examine the resourcefulness, innovations and resiliency nurses have developed during wars-this knowledge could improve global procedures for disaster-preparedness (including systems for responding more effectively to pandemics and bioterrorism). We also found that many nurses would benefit from support mechanisms to prevent post-traumatic stress, burn-

FU N D I N G I N FO R M ATI O N
This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

CO N FLI C T O F I NTE R E S T
No conflict of interest has been declared by the authors.

PEER R E V I E W
The peer review history for this article is available at https://publo ns.com/publo n/10.1111/jan.15454.

DATA AVA I L A B I L I T Y S TAT E M E N T
Data sharing not applicable -no new data generated, or the article describes entirely theoretical research.