 Complete the following phrase:  When at last Werth reappeared in the field it was as general of cavalry in the Imperial and Bavarian and Cologne services. His first campaign against the French marshal Guebriant was uneventful, but his second 1643 in which Baron Franz von Mercy was his commander-in-chief, was the Battle of Tuttlingen in which Werth was instrumental in a surprise victory. In 1644 he was in the lower Rhine country, but he returned to Mercys headquarters in time to fight in the 