Myth vs Fact

Myth	Fact
Islam: Religion of peace.	Reliance of the Traveller, Book O.10.1 Chapter O10.0: The Spoils of Battle O10.1 A free male Muslim who has reached puberty and is sane is entitled to the spoils of battle when he has participated in a battle to the end of it. After personal booty (def: o10.2), the collective spoils of the battle are divided into five parts. The first fifth is set aside (dis: o10.3), and the remaining four are distributed, one share to each infantryman and three shares to each cavalryman. From these latter four fifths also, a token payment is given at the leader's discretion to women, children, and non-Muslim participants on the Muslim side.A combatant only takes possession of his share of the spoils at the official division. (A: Or he may choose to waive his right to it.)
Bottom Line:	What need has the 'religion of peace' for legal rulings on the division of spoils of war? Why is this in the Qur'an? [9:1, 9:41] Why is this in the Hadith? One-fifth of Booty to the Cause of Allah (Khumus) Why is this in Sharia???