In 1795 the French campaign on the Rhine River involved two armies operating independently. After a promising start, the first French army under Jean Baptiste Jourdan was driven back to the west bank of the Rhine. On 29 October the Austrians under Clerfayt routed the French at the Battle of Mainz, forcing them to abandon their siege lines. With Jourdan's army out of the picture, Clerfayt advanced south along the west bank of the Rhine against Pichegru's defenses behind the Pfrimm River near Worms. After beating Pichegru at Pfeddersheim and Frankenthal, Clerfayt isolated the French garrison at Mannheim. Not long afterward, the Austrians successfully wrapped up the Siege of Mannheim, eliminating the French foothold on the east bank of the Rhine and virtually ending the campaign.