Joshua 11:10
And Joshua at that time turned back, and took Hazor, and smote the king thereof with the sword: for Hazor beforetime was the head of all those kingdoms. And Joshua at that time turned back, and took Hazor, and smote the king thereof with the sword: for Hazor beforetime was the head of all those kingdoms.
Hazor had formerly been the head of all those northern kingdoms, the stronghold and center of the northern confederacy. Joshua took the city during Israel's campaign in northern Canaan, turning back to seize it after the allied forces had been routed. Once captured, Hazor was burned.