The Germans, well aware of the vulnerable state of the British defences, launched a counter-stroke on 15 April (the Battle of Lagnicourt). The Germans attacked with 23 battalions against four Australian battalions. The German plan was to drive back the advanced posts, destroy supplies and guns and then retire to the Hindenburg defences. However, despite their numerical superiority, the Germans were unable to penetrate the Australian line. The 1st Division's artillery batteries in front of Lagnicourt were overrun and the village was occupied for two hours but counter-attacks from the Australian 9th and 20th Battalions (the latter from the 2nd Division) drove the Germans out. In this action the Australians suffered 1,010 casualties, mainly in the 1st Division, against 2,313 German casualties. Only five artillery guns were damaged.