Official unit war diaries, reports and records - daily accounts of units on active service

Unit Histories

Search for books including Regimental histories on The Army Museums Ogilby Trust or in A Bibliography of Regimental Histories of the British Army compiled by Arthur S White (Uckfield, East Sussex; Naval and Military Press, 2001).

IWM has an extensive collection of regimental, divisional and operational histories
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Nominal Rolls naming those who served at specific times, died or received awards may occasionally be included. Some examples available online:

Other things to look for:

Download a copy of our guide to tracing your British Army ancestry