II Samuel 18:15 And ten young men that bare Joab’s armour compassed about and smote Absalom, and slew him.
Joab had ten young men as armor bearers. Joab was a great man of war and general. Imagine the training that these young men received. Imagine the men that they had the opportunity to see and hear just from being so close to Joab. They start as young armor bearers that will later be valiant men. Discipleship is all through the Bible. As they carried the armor and prepared things they would see how Joab fought from dressing himself, preparations he made for the battle, how he ordered his men, how set the battle, how he cared for his weapons and many other things that would prepare them for leadership.