There were fifty thousand men from Zebulun. They were trained soldiers and knew how to use every kind of weapon of war. They followed David completely.
All these fighting men were ready to go to war. They came to Hebron fully agreed to make David king of all Israel. All the other Israelites also agreed to make David king.
It was a custom for the king to ask advice from experts about law and order. So King Xerxes spoke with the wise men who would know the right thing to do.