pluralcasualties

1

a

: a military person lost through death, wounds, injury, sickness, internment, or capture or through being missing in action

The army sustained heavy casualties.

b

: a person or thing injured, lost, or destroyed : VICTIM

the ex-senator was a casualty of the last election

2

: serious or fatal accident : DISASTER

losses from fire, storm, or other casualty J. S. Seidman

3

archaic : CHANCE, FORTUNE

losses that befall them by mere casualty Sir Walter Raleigh