"No Quarter"

"Take no prisoners" 

A victor gives no quarter when the victor shows no clemency or mercy and refuses to spare the life in return for the unconditional surrender of a vanquished opponent.

Under the laws of war, "....it is especially forbidden....to declare that no quarter will be given". This was established under Article 23 (d) of the 1907 Hague Convention IV - The Laws and Customs of War on Land.

Since a judgment on the law relating to war crimes and crimes against humanity at the Nuremberg Trials in October 1946, the 1907 Hague Convention, including the explicit prohibition to declare that no quarter will be given, are considered to be part of the customary laws of war and are binding on all parties in an international armed conflict.