The Cambodian genocide

The genocide triggered a second outflow of refugees, many of whom escaped to neighboring Thailand and, to a lesser extent, Vietnam. The Vietnamese invasion of Cambodia ended the genocide by defeating the Khmer Rouge in January 1979. In 2001, the Cambodian government established the Khmer Rouge Tribunal to try the members of the Khmer Rouge leadership responsible for the Cambodian genocide. Trials began in 2009, and in 2014, Nuon Chea and Khieu Samphan were convicted and received life sentences for crimes against humanity committed during the genocide.

Reconstruction: A term used to describe the time in American history directly after the Civil War during which the South was "reconstructed" by the North after its loss in the war.

Salient: (pronounced SAY-lee-uhnt) A part of a defensive line of works or a fortification that juts out from the main line towards the enemy. Salients can be very vulnerable to because they may be attacked from multiple sides.

Lunette: (pronounced loo-net) A fortification shaped roughly like a half-moon. It presented two or three sides to the enemy but the rear was open to friendly lines.

Musket: A smoothbore firearm fired from the shoulder. Thrust from exploding powder shoots the bullet forward like a chest pass in basketball.

Interior Lines: A military strategy which holds that the fastest, most efficient maneuvers, transportation and communication are conducted within an enclosed geographic area as opposed to outside the geographic area.