 He was unaware that the Archduke had arrived by forced marches from Augsburg to the vicinity of Ostrach; Jourdan thought the main force of Charles' army was still at least three days' march away.By the middle of Holy Week in 1799, more than a third of Charles' army, 48,000 mixed troops, was positioned in a formation parallel to Jourdan's, and his 72,000 remaining troops were arrayed with the left wing at Kempten, the center near Memmingen, and the right flank extended to Ulm.As the armies assembled in their positions, the flanks and forward outposts encountered one another in several skirmishes; indeed, they had been skirmishing for seven days, until 19 March, when the outposts of both armies nearly overlapped.