The Battle of Nicopolis took place on 25 September 1396 and resulted in the rout of an allied Crusader army of Hungarian, Croatian, Bulgarian, Wallachian, Polish, French, Burgundian, German, English, Knights Hospitaller, Iberian, Italian, Bohemian, and Byzantine troops at the hands of an Ottoman force, raising the siege of the Danubian fortress of Nicopolis and leading to the end of the Second Bulgarian Empire. Wikipedia