Why WWI Records Matter to Genealogists
The First World War touched nearly every family in the affected nations. For genealogists, wartime service records offer a rare window into an ancestor's life: their physical description, place of birth, occupation before the war, next of kin, and the units they served with. These details can unlock otherwise brick-wall research problems and connect family stories to documented history.
The Impact of Record Loss
Before diving into research, it is important to understand a significant challenge: many WWI military records were destroyed. In the United Kingdom, the 1940 Blitz destroyed an estimated 60–70% of British Army service records from WWI. In the United States, a 1973 fire at the National Personnel Records Center in St. Louis destroyed millions of Army and Air Force records. This does not mean research is impossible — it means researchers must use substitute records creatively.
Key Record Types for WWI Research
Service Records and Pension Files
Where they survive, original service records contain the richest personal detail. For UK researchers, surviving records are often called "burnt documents" due to fire damage but are still partially legible. Pension records frequently survived separately and can substitute for lost service records, often containing medical histories and family information.
Medal Index Cards (UK)
The UK's Medal Index Cards (MIC) are an invaluable resource held by The National Archives at Kew. They record which campaign medals a soldier was entitled to, their regiment and regimental number, and their theatre of service. Almost every man who served overseas has a card, making this one of the most comprehensive surviving WWI records.
War Diaries
Unit War Diaries record the daily activities of battalions, regiments, and ships. While they typically don't name individual soldiers, they describe where a unit was, what operations it undertook, and casualties suffered. Cross-referencing a soldier's unit with its War Diary brings their service to life.
Casualty Records and Commonwealth War Graves
The Commonwealth War Graves Commission (CWGC) maintains records of every Commonwealth service member who died in WWI, searchable online for free. For soldiers who died, the CWGC record shows rank, regiment, date of death, and place of burial or commemoration.
Draft Registration Cards (USA)
American researchers benefit from WWI Draft Registration Cards — completed by nearly all men aged 18 to 45 regardless of whether they actually served. These cards capture physical descriptions, occupations, employers, and nearest relatives, making them useful even for men who were not drafted.
Researching by Country
| Country | Primary Archive | Key Free Resource |
|---|---|---|
| United Kingdom | The National Archives, Kew | CWGC, Medal Index Cards (Ancestry/Findmypast) |
| United States | National Archives (NARA) | Fold3, Ancestry (subscription), Draft Cards (free via Ancestry) |
| Australia | National Archives of Australia | RecordSearch (free), AWM Roll of Honour |
| Canada | Library and Archives Canada | CEF Personnel Files (free online) |
| New Zealand | Archives New Zealand | Archway database (free) |
Building a Full Picture
Beyond official records, local newspapers from the war years frequently published casualty lists, letters from soldiers, and homecoming notices. Regimental histories and published rolls of honour can also place an ancestor in context. Combining these sources with census and civil registration records creates a fuller biography of any WWI ancestor — and honours their service with the recognition it deserves.