 South Vietnamese forces were not constrained by the time and geographic limitations placed upon U.S. units . From the provincial capital of Svay Rieng , ARVN elements pressed westward to Kampong <unk> , where on 14 May their 8th and 15th Armored Cavalry regiments defeated the 88th PAVN Infantry Regiment . On 23 May , the South Vietnamese pushed beyond the deepest U.S. <unk> and attacked the town of <unk> . 
