1. daun, leopold, graf von an able Austrian general, born at Vienna; distinguished himself by his prudence and valour in the Seven Years' War, gained a victoryoverFrederick the Great at Kolin in 1757, and another at Hochkirch in 1758; could prevail little or not at all against Frederick afterwards as soon as Frederick saw through his tactics, which he was not long in doing (1705-1766).