This drill is called 'war' because it is a very physical rebounding drill in which the whole team will be involved.
Separate your big guys and your guards on each end of the court. Use one ball on each side. The drill begins with the first three players in the key. Coach will throw the ball up and it now becomes one on one on one. When a player scores, he goes to the end of the line. The next player comes in and the drill continues. You only get to leave the key after you make a shot.
Keep control of your players. This will become very physical, but is effective in teaching your team to become tougher.
This basketball drill is licensed under a Creative Commons License. This drill is from Pål Degerstrøm at www.degerstrom.com/basketball.