sentences:  The first raid came on the night of 27/28 March, when a force of about 100 Japanese exploited a gap between the 25th Infantry Battalion's main defensive position and its 'B' Echelon—which included its transport and logistics elements and was protected by a company from the 61st Infantry Battalion—fixed bayonets and then assaulted the rear of the Australian perimeter.The Australians had been alerted to their approach after the communication line between the two positions had been cut, and when the attack began the men had already been roused and the weapons pits fully manned.As a result, the attack failed and was turned back.