On the morning of 25 May 1799, around 5 o'clock, General Oudinot encountered the weak Austrian garrison at Frauenfeld. These troops slowly withdrew over the
Thur. Around 9 o'clock however more troops from Hotze's army arrived (six battalions and six squadrons) under
Franz Petrasch of
Wyl, on the left flank and in the rear of the French. The French were forced to bring their main force up against this new enemy. About 22,000 Austrians were now arrayed against about 14,000 French and Swiss troops. This clash continued without a clear victor until evening. As a result, there were very heavy losses. The Adjutant General of the Helvetian troops himself, General
Johann Weber (1752–1799) fell victim to a sharpshooter. Since the outcome of the battle was so unclear, General Petrasch decided to retreat at 7 o'clock in the evening. The Austrians lost about 5,000 men in the battle (mostly captured) and two cannons. During the battle, two further columns of Massena's army attacked the Austrian archduke's main forces near
Rorbas and
Andelfingen in order to push them back over the Thur. After some initial success, however, the French were themselves pushed back. Despite the tactical success at Frauenfeld, Massena's position thus remained untenable and he led a withdrawal in the direction of
Zurich on 26 May. Contemporaries, like
Carl von Clausewitz, criticised Massena for having three columns (and the reserve under Soult) operate separately from one another instead of concentrating his whole force against Hotze's army. Only in this way, they said, could he have defeated the Austrians. == Aftermath ==