Definition of debacle:
(n) :
a breaking or bursting forth; a violent rush or flood of waters which breaks down opposing barriers, and hurls forward and disperses blocks of stone and other debris; an event or enterprise that ends disastrously
"1848 The Brunswickers were routed and had fled -- their Duke was killed. It was a general debacle. - William Makepeace Thackeray, Vanity Fair"