 Farther west in the swamplands that lay on the border of Gia Định and Hậu Nghĩa Provinces, the 4/9th Infantry, killed several dozen soldiers from the retreating 9th Division, while the 1/27th Infantry, mauled an element of the 208th Artillery Regiment, killing 66 gunners and capturing three 122mm rocket launchers.In the 199th Infantry Brigade sector to the south, the 4/12th Infantry, completed its sweep of the Route 10 corridor west of Phu Lam, while the 2/3rd Infantry, cleared out the last VC diehards along the edge of the city south of Highway 4 and to the east of Firebase Horseshoe Bend, killing 16 VC on 11 May.To expedite clearing operations in western Gia Định Province, General Mearns ordered the 4/9th Infantry, to establish a firebase approximately four kilometers west of Tan Son Nhut next to Route 234, a north-south road that crossed the enemy’s line of retreat.