Tuol Sleng Genocide Museum - Non-Cambodian prisoners

Two Franco-Vietnamese brothers named Rovin and Harad Bernard were detained in April 1976 after they were transferred from Siem Reap, where they had worked tending cattle. Another Frenchman named Andre Gaston Courtigne, a 30-year-old clerk and typist at the French embassy, was arrested the same month along with his Khmer wife in Siem Reap.

It is possible that a handful of French nationals who went missing after the 1975 evacuation of Phnom Penh also passed through S-21. Two Americans were captured under similar circumstances. James Clark and Lance McNamara in April 1978 were sailing when their boat drifted off course and sailed into Cambodian waters. They were arrested by Khmer patrol boats, taken ashore, where they were blindfolded, placed on trucks, and taken to the then-deserted Phnom Penh.

Breach: A large gap or "hole" in a fortification's walls or embankments caused by artillery or mines, exposing the inside of the fortification to assault.

"Peculiar Institution": Another term for slavery in the South.

Commutation: Stipulation adopted by both the Union and Confederate governments which allowed certain draftees to pay a fee in order to avoid military service. Because the fee was higher than the average worker's annual salary, this provision angered less-wealthy citizens on both sides of the war.

Barrel: The long metal tube on a gun through which a projectile is fired.

Mortar: An unrifled artillery gun which was designed to launch shells over walls and enemy fortifications. The most famous Civil War mortar is the "Dictator" -- a mortar which was mounted on a railroad car and used during the siege of Petersburg. With its 13 inch bore it was capable of launching two hundred pound shells.