Cambodian Civil War

On 29 March 1970, North Vietnam launched an offensive against the Cambodian army. Documents which were uncovered from the Soviet Union's archives reveal that the invasion was launched at the Khmer Rouge's explicit request after negotiations were held with Nuon Chea. A North Vietnamese force quickly overran large parts of eastern Cambodia reaching within 15 miles (24 km) of Phnom Penh before being pushed back. By June, three months after Sihanouk's removal, they had swept government forces from the entire northeastern third of the country. After defeating those forces, the North Vietnamese turned the newly won territories over to the local insurgents. The Khmer Rouge also established "liberated" areas in the south and the southwestern parts of the country, where they operated independently of the North Vietnamese.

Chevaux-de-Frise: (pronounced sheh-VOH-de-freez) A defensive obstacle constructed by using a long horizontal beam pierced with diagonal rows of sharpened spikes. When several cheval-de-frise (singular, pronounced she-VAL-de-freez) were bolted together they created an effective barrier for roads and fortifications.

Bivouac: (pronounced BIH-voo-ack) Temporary soldier encampment in which soldiers were provided no shelter other than what could be assembled quickly, such as branches; sleeping in the open.

Massacre: The cruel killing of a number of helpless or unresisting people.

Haversack: Small canvas bag, about one foot square, used to carry a soldier's food. Typically, these bags were painted with black tar to make them waterproof.

Nom-de-guerre: (pronounced nahm-duh-gair) Literally, in French this means "war name". A nom-de-guerre is a nickname earned in battle, such as "Stonewall" Jackson or "Fighting Joe" Hooker.