Army Number Search Tool
This search tool can match army numbers from the 1920's to the end of World War 2 which was based on the regiment that a soldier joined initially, and the post war numbering system which is army wide. Pre 1920's, soldiers had regimental numbers so this site cannot be used for matching those.
Enter an army number to find out what unit/regiment block the number was assigned from (upto WW2) or approximately when the soldier joined the army (post WW2).
"Royal Artillery (Field, Coastal & Anti-Aircraft) 1"
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