Marlborough moved his headquarters to the left flank, giving Eugène command of the right flank (which still checked the left wing of the French army). While the right wing was under pressure, Marlborough made a brilliant tactical decision: he placed eighteen newly arrived Hessian and Hanoverian infantry battalions in the left flank to replace twenty of Prussian General Carl von Lottum's battalions, ordered them to move to support Eugène's men. This moved fresh troops to the critical Allied left flank, while reinforcing the Allied right flank and allowing Lottum's troops to be granted a vital rest. Marlborough then began formulating a new plan of double encirclement. He had now under his command the fresh Dutch Army, under Field Marshal Hendrik Overkirk, an experienced military officer and ordered them to flank the French right wing. The Dutch army was unable to cross the collapsed pontoon bridges near Oudenaarde, forcing him to use the stone bridges in the city, delaying him for an hour. Marlborough went ahead with his plan, having Eugène's cavalry charge towards Burgundy's headquarters. The French Household Cavalry, the Maison du Roi, were only just able to turn them back and Marlborough, with only the eighteen Hessian and Hanoverian battalions, was unable to do much other than keep the French right in check. At about 20:30, Overkirk's troops had arrived and flanked the French right wing. This was in conjunction with a dual attack by Marlborough and Eugène. Overkirk's manoeuvre was successful, with much of the French army being routed or captured, with lack of daylight preventing the completion of the manoeuvre.