Archduke Charles stopped long enough at Pforzheim to transfer his military stores to the army's wagon train. Moreau was surprised by his foe's decision to disengage and took several days to digest this information. The French commander planned to attack Pforzheim on 15 July, but by that date Charles was retreating farther to the east. On 21 July, there was a skirmish at Cannstatt near Stuttgart. There were 8,000 Austrians in nine battalions and eight squadrons involved in the clash. From Cannstatt, Charles retreated toward Schwäbisch Gmünd with Moreau following his enemies at a leisurely pace. Meanwhile, the isolated Austrian left wing withdrew through Villingen with Ferino in pursuit. The Swabians and Bavarian began negotiations with the French to quit the war while the Saxons marched away to the north to join Wartensleben's army. When Charles left the banks of the Rhine he left behind 30,000 troops in garrisons at Mannheim, Philippsburg, Mainz, Königstein im Taunus and Ehrenbreitstein Fortress. On 29 July at Biberach an der Riss, the Swabian Regional Contingent was disarmed by Fröhlich on the instructions of Charles. These subtractions left Charles with only three-quarters of the strength of Moreau. On 2 August, Moreau's troops bumped into the Austrians at Geislingen an der Steige and for a week afterward there was constant skirmishing with Charles' rear guard. Saint-Cyr occupied the city of Ulm on 8 August 1796. Two days later, Charles was joined by his left wing. At this time Ferino was at Memmingen to the south of the Danube.