The Beaurevoir Line was the last of a series of German defensive lines known collectively by the Allies as the Hindenburg Line. It was approximately eight kilometres to the rear of the main Hindenburg Line and consisted of thick barbed wire entanglements and well-sited machine and anti-tank gun bunkers. The bulk of the trenches, however, were only partly dug. The original attack on the Hindenburg Line launched on 29 September had been intended to smash right through the Beaurevior Line as well, but had not succeeded in this objective. Along with the 46th British Division, the 2nd Australian Division was ordered to breakthrough the Beaurevoir Line on 3 October 1918. The Australians were to seize the village of Beaurevoir, and the British Montbrehain. The Australian attack was a success, but was stopped short of the village due to insecure flanks. The British captured Montbrehain, but were unable to retain it. After an ill-fated attempt to capture Beaurevoir on 4 October, the 6th Australian Brigade was launched against Montbrehain the next morning. The village was secure by the end of the day, but came at the expense 430 casualties - a cost regarded as excessively high for such a limited objective. The action at Montbrehain was the last battle fought by Australian infantry during the war.