The British Army Casualty Index War of 1812 contains the details of over 12,000 soldiers in the British Army who died, deserted, or were imprisoned during the War of 1812 (or the Anglo American War). The War of 1812 was a two and a half year military conflict fought by the United States of America against the United Kingdom of Great Britain and Ireland, its North American colonies, and its American Indian allies. Seen by the United States and Canada as a war in its own right, it is seen in Europe as a theatre of the Napoleonic Wars. British losses during the War are estimated to be have been over 1,600 killed in action, 3,679 wounded and 3,321 dead from disease.

Each record consists of a transcript of the original source material. Records will reveal the soldiers name, birth place, former occupation, rank, regiment or unit, place or action, company officer, company number, removal date and manner of removal this may include information on how a soldier died or whether he deserted or was a prisoner of war.