Tuol Sleng Genocide Museum - Torture and extermination

For the first year of S-21's existence, corpses were buried near the prison. However, by the end of 1976, cadres ran out of burial spaces, the prisoner and family members were taken to the Boeung Choeung Ek ("Crow's Feet Pond") extermination centre, fifteen kilometers from Phnom Penh. There, they were killed by a group of teenagers led by a Comrade Teng, being battered to death with iron bars, pickaxes, machetes and many other makeshift weapons owing to the scarcity and cost of ammunition. After the prisoners were executed, the soldiers who had accompanied them from S-21 buried them in graves that held as few as 6 and as many as 100 bodies.

Defilade: (pronounced DEH-fih-lade) To arrange walls, embankments and other features of a fortification or field work so that the enemy cannot make an accurate shot inside.

Bummer: A term used to describe marauding or foraging soldiers. Although armies on both sides often had rules against foraging or stealing from private residences, some soldiers often found ways to do so.

Insult: A sudden, open, unconcealed attack upon a fortified position with the intent of capturing it before its defenders could mount an effective defense.

Breastworks: Barriers which were about breast-high and protected soldiers from enemy fire.

Flank: Used as a noun, a "flank" is the end (or side) of a military position, also called a "wing". An unprotected flank is "in the air", while a protected flank is a "refused flank". Used as a verb, "to flank" is to move around and gain the side of an enemy position, avoiding a frontal assault.