Tallard, with 34,000 men, reached Ulm, joining with Maximilian and Marsin at Augsburg on 5 August, although Maximilian had dispersed his army in response to Marlborough's campaign of ravaging the region. Also on 5 August, Prince Eugene reached Höchstädt, riding that same night to meet with Marlborough at Schrobenhausen. Marlborough knew that another crossing point over the Danube was required in case Donauwörth fell to the enemy. So on 7 August, the first of Prince Louis' 15,000 Imperial troops left Marlborough's main force to besiege the heavily defended city of Ingolstadt, farther down the Danube, with the remainder following two days later.