ジャール平原
As the Laotian Civil War flared, the Central Intelligence Agency established a secret guerrilla army in the Plain of Jars. Interposed between the communist settlement around Xam Neua and the Royal Lao Government in Vientiane, the Hmong military irregulars fought to hold on to their traditional territory, and to preserve Laos. After the failure and defeat of Operation Pigfat, the communists had overrun the Plain of Jars to within ten kilometers of the guerrillas' main base at Long Chieng. They were poised to turn the Hmong army's western flank.