 During the night of 18 November , the Austro @-@ Hungarians moved into position to carry out a further assault , which began the following morning . The Austro @-@ Hungarians ' main goal was to break through the defenses of the Serbian 2nd Army , concentrated primarily around Lazarevac , and to drive the Serbian 1st Army back towards the town of Gornji Milanovac while simultaneously assaulting Serbian positions around the villages of Čovka and Vrače Brdo which threatened the Austro @-@ Hungarian flank . The Austro @-@ Hungarians gained a foothold at Vrače Brdo by the evening of 19 November , and seized higher ground from the Serbs further to the south . The Serbian 1st Army was forced to retreat the following day , giving the Austro @-@ Hungarians the ability to advance down the main routes leading to Kragujevac . Potiorek believed it was possible that Putnik was trying to lure the Austro @-@ Hungarians deeper into Serbia for the purpose of encircling them and then attacking their flanks , but correctly assessed that the Serbian Army was in no position to carry out such an attack . 
