But Marlborough conceived the bold project of marching his troops to the banks of the Danube, and there uniting with the Imperialists under Prince Eugene, to cut off the forces of the enemy before they could unite. So he left the Dutch to defend themselves against Villeroy, rapidly ascended the Rhine, before any of the enemy dreamed of his designs. From Mentz, he proceeded with forty thousand men to Heidelberg, and from Heidelberg to Donauworth, on the Danube, where his troops, which had effected a junction with the Austrians and Prussians, successfully engaged the Bavarians. But the Bavarians and the French also succeeded in uniting their forces; and both parties prepared for a desperate conflict. There were about eighty thousand men on each side. The French and Bavarians were strongly intrenched at the village of Blenheim; and Marlborough, against the advice of most of his generals, resolved to attack their fortified camp before it was reënforced by a large detachment of troops which Villeroy had sent. "I know the danger," said Marlborough; "but a battle is absolutely necessary." He was victorious. Forty thousand of the enemy were killed or taken prisoners; Tallard himself was taken, and every trophy was secured which marks a decisive victory. By his great victory, the Emperor of Austria was relieved from his fears, the Hungarians were overawed, Bavaria fell under the sway of the emperor, and the armies of Louis were dejected and discouraged. Marlborough marched back again to Holland without interruption, was made a prince of the empire, and received pensions and lands from the English government, which made him one of the richest and greatest of the English nobility. The palace of Blenheim was built, and he received the praises and plaudits of the civilized world.
The French were hardly able to cope with Marlborough during the next campaign, but rallied in 1706, during which year the great battle of Ramillies was fought, and won by Marlborough. The conquest of Brabant, and the greater part of Spanish Flanders, resulted from this victory; and Louis, crippled and humiliated, made overtures of peace. Though equitable, they were rejected; the allies having resolved that no peace should be made with the house of Bourbon while a prince of that house continued to sit upon the throne of Spain. Louis appealed now, in his distress, to the national honor, sent his plate to the mint, and resolved, in his turn, to contend, to the last extremity, with his enemies, whom success had intoxicated.