If you are engaged in a war with disbelievers, fight with them bravely and strike their necks. When the war is over, you may chose to free the captives or ask for a ransom for their freedom. Know that if God wanted, he would have made you victorious without any fight. The Lord simply wants to test you by one another to prove to you how sincere you are in your belief. Be sure that God will never forget the sacrifice of those who offered their lives as a proof of their belief to their Creator.