About 08:00 the French artillery on their right wing opened fire, answered by Colonel Holcroft Blood's batteries. The guns were heard by Prince Louis in his camp before Ingolstadt. An hour later Tallard, Maximilian, and Marsin climbed Blenheim's church tower to finalise their plans. It was settled that Maximilian and Marsin would hold the front from the hills to Oberglauheim, whilst Tallard would defend the ground between Oberglauheim and the Danube. The French commanders were divided as to how to utilise the Nebel. Tallard's preferred tactic was to lure the allies across before unleashing his cavalry upon them. This was opposed by Marsin and Maximilian who felt it better to close their infantry right up to the stream itself, so that while the enemy was struggling in the marshes, they would be caught in crossfire from Blenheim and Oberglauheim. Tallard's approach was sound if all its parts were implemented, but in the event it allowed Marlborough to cross the Nebel without serious interference and fight the battle he had planned.