On the 25th of April Moreau began his movement. Ste. Suzanne crossed the Rhine at Kehl, ascended the Kinzig valley, and pushed Kienmayer's outposts back into the Black Forest. At the same time St. Cyr crossed at Brisach; one division of his corps then advanced towards the Kinzig valley, while the other divisions forced back the Austrians at Friburg, and occupied the entrance to the Höllenthal. On the next day Kray at Donaueschingen heard of these movements. Having received word that a part of his right wing had been attacked by forty thousand men, he was led to believe that Moreau intended to force his way through the Black Forest by way of the Kinzig valley. He therefore sent seven thousand Austrians from Villingen to re-enforce Kienmayer, and to replace these troops withdrew seven thousand men from his reserve at Stokach. At the same time he ordered his extreme right, under Starray, to move towards the main army into the valley of the Murg. On the 27th of April Ste. Suzanne withdrew his corps from its advanced position preparatory to recrossing the Rhine at Kehl. St. Cyr, having directed his artillery and trains to follow the river road on the right bank towards Schaffhausen, led his infantry across the hills towards St. Blazien. Moreau crossed the Rhine at Bâle with the reserve; one of his divisions, commanded by General Richepanse, then ascended the Weiss River, so as to join the right of St. Cyr's corps; the other two, commanded by Moreau in person, marched up the Rhine towards Schaffhausen. On the following day Ste. Suzanne recrossed at Kehl, and proceeded up the left bank of the Rhine towards Brisach. St. Cyr, having united a part of his forces with Richepanse's division, occupied St. Blazien. Moreau himself forced a passage across the Alle River, and drove back an Austrian brigade there, which retreated towards Bonndorf. On the 30th of April Ste. Suzanne, having arrived at Brisach, again crossed the Rhine to the German side, and took up the position at Friburg, at the entrance to the Höllenthal, recently occupied by St. Cyr's troops. St. Cyr remained in the vicinity of St. Blazien. Moreau advanced upon the Wutach River, and Lecourbe concentrated his corps on the south bank of the Rhine near Schaffhausen, preparatory to crossing the river at that point. Thus the French corps continued to push forward. On the 1st of May Moreau reached Schaffhausen, where he was joined by Lecourbe's corps, part of which crossed the river in boats, and the remainder over a bridge temporarily constructed for the purpose. St. Cyr reached Stuhlingen, and Ste. Suzanne, having driven back the Austrian brigade occupying the Höllenthal, arrived at Neustadt.