During these movements the Austrian outposts along the Rhine fell back before Moreau to Stuhlingen, and, upon St. Cyr's arrival at that place, retreated upon Zollhaus. Meanwhile Kray had directed part of his own immediate command upon Loffingen and Zollhaus. Kienmayer, with the greater part of his forces, still remained in the valley of the Kinzig, and Starray in the valley of the Murg. Thus the first part of Moreau's plan was successfully executed. As yet he had met with no reverse. His forces had driven before them the Austrian outposts and advance brigades, till now three of his corps, numbering eighty-five thousand men, were within supporting distance of one another on the north side of the Rhine near Schaffhausen. From this favorable position he could march at once against Kray in the Black Forest, and outnumber him almost two to one; for Kray could not expect immediate aid from his left wing, which was beyond Lake Constance on the borders of eastern Switzerland and in the Tyrol, or from his right wing, which was far away in the valleys of the Kinzig and the Murg. Kray now began to appreciate the insecurity of his position. He perceived that his reserve and immense magazines at Stokach were in danger. Should Moreau capture this place and push rapidly forward towards Ulm, he would sever the Austrian communications, and thus place Kray in a position where a defeat would ruin his army. In order to prevent, if possible, such a result, Kray decided to unite his forces at Stokach, and there give battle to Moreau. With this end in view, Kray caused the following movements to be made. On the 2d of May the Austrian brigade that had been driven from Neustadt by the advance of Ste. Suzanne, moved to Bonndorf; the Austrians at Bonndorf marched to Zollhaus; and those at Zollhaus, to Geisingen, where Kray had collected the Austrian troops under his immediate command. On the 3d of May his columns advanced towards Stokach over the Geisingen-Engen road. Meanwhile Moreau was not idle. On the 3d of May he moved on Engen with the reserve; St. Cyr on Zollhaus; and Lecourbe, having directed two brigades to ascend the Aach River, in order to connect with the right of the reserve, marched on Stokach with about twenty thousand men, attacked and defeated the twelve thousand Austrians there, captured the immense magazines, and forced the Austrians back towards Ulm by way of Mosskirch and by way of Memmingen. But after this victory Lecourbe, not receiving any orders from Moreau to push forward and seize Mosskirch, remained in the vicinity of Stokach, awaiting the result of the operations of Moreau at Engen.