 Australian signals intelligence (SIGINT) had tracked the VC 275th Regiment and D445 Battalion moving to a position just north of Long Tan.By 16 August, it was positioned near Long Tan outside the range of the artillery at Nui Dat.On the night of 16/17 August, mortars and recoilless rifles attacked Nui Dat from a position to the east until counter-battery fire caused it to cease.