sentences:  Another probe was made early on the morning of 28 March on the positions of the Australian 5th Field Battery, whose eight guns were located east of Toko, on the west bank of the Puriata River from where they could provide defensive fires in support of the 25th Infantry Battalion's main positions on the knoll.Shortly before dawn one of the booby traps that the Australians had set around their perimeter to provide early warning was set off and one of the sentries opened fire upon what he believed to be a Japanese probe.A short time later, a small section of Japanese stumbled into one of the forward positions and fire was exchanged.