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In page Long Tieng:

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North Vietnamese forces began to threaten Long Tieng in late 1971, and came close enough to start shelling the area on December 31 at 15:30 local time. In early January, 19,000 North Vietnamese forces launched a four pronged attack on Long Tieng from all four cardinal directions, encircling the site, capturing several facilities and positions, and installing antiaircraft batteries. Despite subsequent claims of victory from communist forces, the 10,000 defenders of Long Tieng, a mixture of Hmong, Thai, and Lao, had not been overrun, and in mid-month reinforcements appeared in the form of CIA-led Thais and 1200 elite irregulars from southern Laos. After enduring a third to 50% casualties, these forces succeeded in taking back key positions by the end of the month.[4]