On 27 August at 01:35 a U.S. Navy PBR and a patrol from the 1st Brigade, 1st Infantry Division ambushed a 15-20 man PAVN/VC unit attempting to cross the Saigon River 8 miles south-southeast of Dầu Tiếng, the area was illuminated by flares and helicopter gunships and an AC-47 also engaged, killing 15 PAVN/VC.