 Complete the following phrase:  Defrance also served in the Swiss Campaign of 1799 as divisional Chief of Staff of the 1st Division of Jean-Baptiste Jourdans Army of the Danube; after the losses at the battles of Ostrach and Stockach in March 1799, the Army of the Danube was combined with the Army of Helvetia, under the command of Andre Massena. Defrance continued in his capacity as divisional chief of staff. At the 