The two armies, roughly equal in size, stumbled upon one another, taking both by surprise. In the midst of the confusion and heavy rain, MacDonald seemed to recover first. Although his orders were to defend the flank of Napoleon's main force from Blücher, MacDonald decided to attack. He dispatched two-thirds of his army, about 60,000 men, in an attempt to flank the Russo-Prussian right. But confusion reigned again as the French columns found themselves too far apart to support one another. The attack lost momentum.