 He was replaced in this duty by Sergeant Roger D. Huffman on about 4 March.On 18 February 1968, a PAVN artillery survey team was ambushed near Lima Site 85 by Hmong reconnaissance teams, killing a PAVN officer in the process.The dead officer, who was a major, carried a notebook which revealed a plan to attack Phou Pha Thi by using three PAVN battalions and one Pathet Lao battalion.