calamities — a great misfortune or disaster, as a flood or serious injury.
casualties — Military. 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. casualties, loss in numerical strength through any cause, as death, wounds, sickness, capture, or desertion.
setbacks — a check to progress; a reverse or defeat: The new law was a setback.