Tallard's march presented a dilemma for Prince Eugene. If the Allies were not to be outnumbered on the Danube, he realised that he must either try to cut Tallard off before he could get there or he must reinforce Marlborough. If he withdrew from the Rhine to the Danube, Villeroi might also make a move south to link up with Maximilian and Marsin. Prince Eugene compromised—leaving 12,000 troops behind guarding the Lines of Stollhofen—he marched off with the rest of his army to forestall Tallard.