United States - Operation Breakfast

From 1970 to 1973 a massive United States bombing campaign against the Khmer Rouge devastated rural Cambodia. An earlier U.S. bombing campaign of Cambodia actually started on 18 March 1969 with Operation Breakfast, but U.S. bombing in Cambodia started years earlier than that.

The number of Cambodian civilian and Khmer Rouge deaths caused by U.S. bombing is disputed and difficult to disentangle from the broader Cambodian Civil War. Estimates range from 30,000 to 500,000. Sliwinski estimates that approximately 17% of total civil war deaths can be attributed to U.S. bombing, noting that this is far behind the leading causes of death, as the U.S. bombing was concentrated in underpopulated border areas. Ben Kiernan attributes 50,000 to 150,000 deaths to the U.S. bombing.

Revetment: A structure built to hold either natural or man-made embankments in position. Revetments could be made of items such as sandbags, fascines, gabions, brick, stone, and so on.

Howitzer: A cannon which fired hollow projectiles and was generally lighter and shorter than its solid-shot cousins. A howitzer's projectiles had a smaller powder charge. Also, canister projectiles contained more small balls than other types of canister. Howitzers were useful in defending fortifications and causing disorder within with in an attacking force.

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.

Muster: To formally enroll in the army or to call roll.

Percussion Arm: A musket or rifle-musket that requires a cap to fire. A tiny cap is placed on the gun so that when a trigger is pulled, the hammer strikes the cap. The chemical in the cap (fulminate of mercury) ignites and flame shoots into the chamber that holds the gunpowder. This ignites the powder and the blast shoots the bullet out of the barrel. (Percussion means striking�"a drum is a percussion instrument and a gun that uses a hammer to strike a cap is a percussion arm.)