The first onslaught of the Austrians in August, 1914, had been driven back. A disorganized mob, the soldiers of Franz Josef had fled back across the Drina and the Save, leaving thousands of dead and prisoners behind. And for over a week the little Serbian army lay panting. Military science says that a victory should always be followed up closely, for a beaten army is almost as helpless as a herd of cattle. But military science must also take into account the limitations of human muscles and nerves. The Serbian reserve forces had been moving back and forth along the fighting front, strengthening a defense here, supporting an attack there, and some of them had covered from fifty to sixty miles a day. There were no fresh troops to pursue the Austrians. The Serbians needed rest. And so the Austro-Hungarian soldiers were allowed to continue their northward flight unmolested. Thus for twelve days after the Battle of Shabatz, or from August 23, 1914, there was quiet along the Austrian and Serbian frontier. The remnants of the Austrians had definitely retired northward. And at about that time the Russians were driving hard at the Galician front. The Austrians were being beaten there, too. Altogether the situation looked extremely serious for Austria at that time. But, finally, encouraged by the Allies, the Serbian General Staff decided to send an expedition over into Austrian territory. Not much over twenty miles north of Shabatz is a range of mountains, called the Frushkagora. A fairly strong force holding these rocky ridges would be in a position to prevent the Austrian general from reenforcing his armies in Bosnia and Herzegovina from the east. It would also afford a better protection to the northern frontier of Serbia than would a force of the same size stationed within Serbian territory along the Save River. The chief thought of the Serbian general was, however, to gain control of this natural position and hold it while another Serbian force was invading Bosnia, in conjunction with the Montenegrin troops. What made this first objective the more tempting was the known fact that between the frontier and the Frushkagora range the Austrian forces amounted only to about a dozen regiments. To the First Army, General Putnik assigned the execution of this expedition. That was now composed of two divisions, and the cavalry division, which had rendered such excellent service on the Matchva Plain during the first invasion. The left wing of this expeditionary force was to be supported by a division in Matchva, while the "Detachment of Belgrade" was to operate on the right. A second reserve division was to hold Obrenovatz.