British Army by Year - Military - Classic Movie Actors and Actresses(p1) : Classic Movie Hub (CMH)

Claude Rains served in the London Scottish Regiment during WWI; was involved in gas attack that left him nearly blind in one eye for the rest of his life.

Claude Rains
1910s

War: WWI

Ronald Colman served in London Scottish Regiment; was seriously wounded by shrapnel at Battle of Messines; had limp he attempted to hide throughout acting career.

Ronald Colman
1910s

War: WWI

Herbert Marshall lost part of his right leg in WWI, serving in the London Scottish Regiment of the British Army. Walked with limp rest of his life.

Herbert Marshall
1910s

War: WWI

Basil Rathbone served as an intelligence officer during WWI, attaining rank of captain; scouted enemy positions (before film career)

Basil Rathbone
1916

War: WWII

David Niven interupted career to serve; took part in Normandy Invasion arriving several days after D-Day; served in Phantom Signals Unit reporting enemy positions