1967, Colonel Hiếu launched Operation Đại Bàng 800. For three days prior to Vietnamese operation, units of the US 1st Cavalry Division were unsuccessful in discovering the enemy in their operational areas. Hiếu lured the enemy by dispatching a reduced regiment to set up an overnight camp in Phù Mỹ, knowing that enemy spies amongst the indigenous farmers would report the status of the operational troops. Hiếu positioned a motorized infantry battalion and an armored unit 10 kilometers away. Thinking they had an easy target, the enemy attacked the camp with a regiment belonging to the PAVN 3rd Division at 2:00 a.m. Alerted by the regiment's commander, Hiếu sent in the reserve forces to cut off the enemy's retreat and join forces with the defenders. After a three-hour fierce battle, the enemy reportedly left behind more than 300 dead and numerous weapons. In August 1969 General Le Ngoc Trien replaced Hiếu as commander of the 22nd Division and Hiếu replaced the inept, but politically-connected General Phạm Quốc Thuần as commander of the 5th Division, however US officials had major reservations about this replacement, not regarding Hiếu as a dynamic leader. Toàn Thắng 46 From May to July 1970, the 5th Division participated in the Cambodian Campaign with Operation Total Victory 46 in the Fishhook area, north of Lộc Ninh. This base area was considered to be used by the PAVN 5th Division as a headquarters location and training area and the 70th Rear Service Group which moved supplies down the Serges Jungle Highway. Elements of the PAVN 5th Division were identified along with elements of the 70th Rear Service Group and its affiliated hospitals. The division's mission was to attack and destroy the 70th and 80th Rear Service Groups: one hospital and one training center. Division elements will locate and destroy or evacuate enemy foods, ammunition, weapons and medical caches in the operational area. In preparation for the operation Hiếu with his G3, the CDAT commander and the DCAT G3 made the initial area coordination with General Casey of the 1st Cavalry Division and his G3. Upon completion of this initial coordination the Assistant Division Commander of the 5th Division, Commanding Officer of the 9th Regiment, and the DCAT G3 effected direct coordination with the 11th Armored Cavalry Regiment. During the operation coordination was made by the 9th Regimental Commander and his DCAT Commander for the joint occupation of Fire