For folks who seem to think the definition of "casualties" doesn't include "deaths" I paste the following from Dictionary.com
[kazh-oo-uh l-tee] Show IPA
noun, plural cas·u·al·ties.
1. Military .
~ a. a member of the armed forces lost to service through death, wounds, sickness, capture, or because his or her whereabouts or condition cannot be determined.
~ b.casualties, loss in numerical strength through any cause, as death, wounds, sickness, capture, or desertion.
World English Dictionary
— n , pl -ties
1. a serviceman who is killed, wounded, captured, or missing as a result of enemy action