The Battle of Ban Houei Sane was a battle of the Vietnam War that began on the night of 23 January 1968, when the 24th Regiment of the People's Army of Vietnam (PAVN) 304th Division overran the small Royal Lao Army outpost at Ban Houei Sane. The fighting at Ban Houei Sane was one in a series of battles fought between North Vietnamese and Allied forces during the Tet Offensive. The small outpost, defended by the 700 man Bataillon Volontaire (BV-33), was attacked and overwhelmed by the vastly superior PAVN and their PT-76 light tanks. The failure of BV-33 to defend their outpost at Ban Houei Sane had negative consequences only a few weeks later, when the PAVN struck again at Lang Vei.