'Mustered' in the Bible

Joab returned from his pursuit of Abner, and when he had mustered his entire army, nineteen of David's soldiers were missing besides Asahel.

When David learned this, he mustered all of Israel, crossed the Jordan River, and approached Helam. The Arameans assembled in battle array to attack David, and started their assault.

So David mustered his entire army and marched on Rabbah, attacked it, and captured it.

My advice therefore is this: Let all Israel from Dan to Beer Sheba -- in number like the sand by the sea! -- be mustered to you, and you lead them personally into battle.

David mustered his forces and appointed officers in charge of regiments and companies.