Family military research rarely follows a neat or predictable path. One surviving medal card can lead to a battalion war diary. A casualty notice in a local newspaper can suddenly explain why a soldier disappeared from electoral records after 1917. Sometimes, though, the most powerful stories emerge when two men from the same family take very different paths through the same war.
Recently, we were commissioned to research two brothers who served in the King's Own Yorkshire Light Infantry during the First World War. The client arrived with only fragments of information: two names, a faded family photograph, and the belief that one brother had been killed while the other somehow survived the war despite serving on the Western Front for several years.
What followed became a fascinating case study in how military records, casualty databases, war diaries, census material, and regimental history can be woven together to reconstruct not just military service, but the emotional reality of a family living through the Great War.
KOYLI soldiers relaxing with a game of cards during a brief respite from front-line service in the First World War.
Beginning with Almost Nothing
The two brothers, Arthur and Samuel Hartley, were born in Barnsley in the late 1890s. Their father worked in the local collieries, and like many South Yorkshire families of the period, military service and industrial labour were closely intertwined. The surviving photograph showed both men in uniform, but with no visible service numbers or cap badge detail clear enough for immediate identification.
This is an extremely common starting point for First World War research. Many service records were destroyed during the Blitz in 1940, meaning researchers are often forced to build a soldier’s story from smaller surviving fragments. Rather than relying on a single definitive file, successful research usually involves assembling dozens of separate sources into one coherent narrative.
In this case, the first breakthrough came through medal index cards and surviving enlistment data. Both brothers appeared in the records of the King's Own Yorkshire Light Infantry, but importantly, they served in entirely different battalions.
That distinction would prove critical.
If reading the story of the Hartley brothers has inspired you to begin researching your own family’s military history, our step-by-step guide can help you take the first steps. Whether you only have a name, a regiment, or an old photograph tucked away in a drawer, you may be surprised how much can still be uncovered over a century later.
Arthur Hartley and the 1st Battalion: A Professional Army at War
Arthur, the elder brother, appeared to have enlisted before the war fully escalated into mass recruitment. His service number and surviving records suggested early wartime enlistment into the 1st Battalion, KOYLI — a Regular Army battalion that had already deployed overseas in 1914.
This immediately changed the shape of the story.
The 1st Battalion had experienced some of the most brutal fighting of the early war. By tracing battalion movements through war diaries and operational histories, we were able to identify Arthur’s probable involvement in several major campaigns, including the fighting around Ypres and later operations along the Somme sector.
One of the most valuable parts of battalion-level research is understanding that soldiers did not simply “serve in France.” Different battalions experienced the war in dramatically different ways. Some units endured relentless front-line fighting for months. Others spent periods in quieter sectors, rebuilding after catastrophic losses.
The KOYLI battalions developed a formidable reputation during the war, but they also suffered heavily. Casualty lists revealed that Arthur’s battalion sustained severe losses during repeated trench assaults in 1915 and 1916. Even where an individual soldier’s precise movements cannot always be pinpointed, reconstructing the battalion’s operational history allows families to understand the conditions and dangers their relatives almost certainly experienced.
Arthur survived these battles, but the records suggested repeated periods away from the line. Hospital admission rolls and absent voter lists hinted at illness and possible wounds. Like many long-serving infantrymen, his war was probably one of endurance as much as heroism.
Samuel Hartley and the New Army Battalions
Samuel’s story unfolded very differently.
Unlike Arthur, Samuel appeared to have joined after the outbreak of war during the great wave of patriotic recruitment associated with Kitchener’s Army. His service number linked him to a later-war KOYLI Service Battalion rather than a Regular unit.
This distinction matters enormously in First World War research.
The wartime “Service Battalions” were composed largely of civilian volunteers — miners, clerks, labourers, railway workers, and factory hands who often enlisted alongside friends, neighbours, and relatives. These battalions developed powerful local identities, particularly in Yorkshire communities where entire streets might contribute men to the same unit.
Samuel’s battalion trained in Britain before deployment to the Western Front in 1916. Through local newspaper archives, we discovered references to farewell gatherings and casualty reports tied directly to his battalion’s recruitment area. Suddenly the research became far more personal. These were no longer abstract military units; they were communities in uniform.
The tragedy emerged when we located Samuel within the records of the Commonwealth War Graves Commission.
Samuel Hartley had been killed during the Third Battle of Ypres in 1917.
Using CWGC Records to Reconstruct Final Moments
The records held by the Commonwealth War Graves Commission are among the most emotionally powerful sources available to military researchers. Beyond confirming death details, they often reveal burial locations, memorial inscriptions, next of kin, and sometimes even family addresses.
Samuel’s entry confirmed that he had no known grave and was commemorated on the Tyne Cot Memorial in Belgium.
This immediately tells an experienced researcher several things.
A soldier commemorated on a memorial to the missing rather than buried in an identified grave was often lost during intense fighting where recovery proved impossible. In the mud and chaos of Passchendaele, this was tragically common. Artillery fire could obliterate trenches entirely. Bodies disappeared into flooded shell holes. Battlefield conditions often made organised burial impossible.
By cross-referencing battalion war diaries with casualty dates, we were able to narrow Samuel’s likely final action to a specific assault near the Passchendaele Ridge. The battalion suffered devastating casualties advancing through mud under machine-gun and artillery fire.
For the client, this transformed Samuel from a name on a memorial into a real individual caught within one of the war’s most infamous battles.
The Emotional Weight of Two Parallel Stories
What made this research especially compelling was the contrast between the brothers’ experiences.
Arthur survived years of front-line service and returned home after the war. Electoral registers and later census material showed him resuming civilian life in Yorkshire during the 1920s. He married, raised children, and spent decades working in heavy industry.
Samuel never returned.
Yet the research also revealed how closely linked their wartime experiences remained. At one stage in 1917, both brothers were serving in France simultaneously, albeit in different sectors. Family correspondence no longer survives, but it is impossible not to imagine the anxiety experienced by parents waiting for letters from two sons serving overseas.
This is often what military research uncovers most effectively: not simply campaigns and dates, but the emotional geography of wartime families.
Many families in industrial towns such as Barnsley endured similar experiences. One son might survive the war physically intact but psychologically altered forever. Another might vanish entirely into the casualty lists. The impact extended far beyond the battlefield itself.
Why Battalion Research Matters So Much
One of the biggest misconceptions in First World War genealogy is the belief that identifying a regiment alone is enough. In reality, battalion-level research is often the key to understanding a soldier’s actual wartime experience.
The difference between serving in the 1st Battalion KOYLI and a later Service Battalion could mean entirely different recruitment backgrounds, training experiences, theatres of war, casualty rates, and operational histories.
Without identifying the correct battalions, Arthur and Samuel’s stories would have remained vague and incomplete. Once the battalion data emerged, the entire picture sharpened dramatically.
That is why modern military research increasingly combines service records with operational analysis. Understanding where a battalion fought, when it suffered losses, and what conditions it endured allows researchers to build narratives far richer than a simple service timeline.
Bringing the Past Back Into Focus
By the end of the project, the client possessed far more than a collection of military documents.
They had a reconstructed family story.
They understood why one brother appeared on a memorial in Belgium while the other returned to Yorkshire after the war. They could trace the likely campaigns both men fought in, the nature of the battalions they served with, and the vastly different paths their wartime experiences took.
Most importantly, they could finally place both brothers within the wider human story of the First World War.
For many families, that is ultimately the true value of military research. It is not simply about medals or service numbers. It is about recovering lives from the enormous machinery of war and understanding how ordinary individuals experienced extraordinary events.
And sometimes, as with the Hartley brothers of the King's Own Yorkshire Light Infantry, those stories reveal both the tragedy and endurance that defined an entire generation.
How can we help?
If you would like professional help uncovering a soldier’s wartime story, we also offer detailed military research services covering both the First and Second World Wars. From service records and battalion histories to medal entitlement, casualty research, and campaign reconstruction, our reports are designed to turn fragments of family history into a clear and meaningful narrative.
Author: Matthew Holden