 The campaign in the upper <unk> valley began in October , with several clashes in <unk> . Near the Bavarian town of <unk> , 40 kilometers ( 25 mi ) northwest of <unk> , on 8 October the 1st Regiment of <unk> , part of <unk> 's Reserve Cavalry Corps , and grenadiers of <unk> ' V Corps surprised an Austrian force half its size . The Austrians were <unk> in a line and unable to form their defensive squares quickly enough to protect themselves from the 4 @,@ 000 <unk> and 8 @,@ 000 grenadiers . Nearly 3 @,@ 000 Austrians were captured and over 400 were killed or wounded . A day later , at another small town , <unk> south of the <unk> <unk> French 59th Regiment of the Line stormed a bridge over the <unk> and , <unk> , chased two large Austrian columns toward Ulm . 
