At that time Joshua turned back and captured Hazor and put its king to the sword, because Hazor was formerly the head of all these kingdoms.
KJV
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.
ASV
And Joshua turned back at that time, and took Hazor, and smote the king thereof with the sword: for Hazor beforetime was the head of all those kingdoms.