PD-notice 21-2 On 20 December at 11:00 a unit of the 3rd Brigade engaged an enemy platoon 14 miles east-southeast of Pleiku, the enemy withdrew into a cave and evaded the unit, but a search of the cave complex found a weapons cache containing seven individual weapons, 97 RPG-2 grenades 72 82mm mortar rounds an 1-ton of rice.