On May 20, 1966, close to dusk and in a light rain, B Company, 1st Battalion, 8th Cavalry (ABN/AMB), 1st Brigade, 1st Cavalry Division, commanded by Capt. Roy D. Martin was airlifted by Chinook helicopters (CH-47s) into a small clearing located in the mountains east of the Vinh Thanh Valley, Republic of Vietnam. The clearing had been designated LZ Horse and could accommodate only one CH-47 at a time.  The company had been ordered to the LZ to begin operations in search of a large NVA/VC...