Marshal Tallard, who commanded forty-five thousand men at Strasburg, and who had been destined by Louis to march early in the year into Bavaria, thought that Marlborough's march along the Rhine was preliminary to an attack upon Alsace; and the marshal therefore kept his forty-five thousand men back in order to support France in that quarter. Marlborough skilfully encouraged his apprehensions by causing a bridge to be constructed across the Rhine at Philipsburg, and by making the Landgrave of Hesse advance his artillery at Manheim, as if for a siege of Landau. Meanwhile the Elector of Bavaria and Marshal Marsin, suspecting that Marlborough's design might be what it really proved to be, forbore to press upon the Austrians opposed to them, or to send troops into Hungary; and they kept back so as to secure their communications with France. Thus, when Marlborough, at the beginning of June, left the Rhine and marched for the Danube, the numerous hostile armies were uncombined, and unable to check him.
"With such skill and science had this enterprise been concerted, that at the very moment when it assumed a specific direction, the enemy was no longer enabled to render it abortive. As the march was now to be bent towards the Danube, notice was given for the Prussians, Palatines, and Hessians, who were stationed on the Rhine, to order their march so as to join the main body in its progress. At the same time directions were sent to accelerate the advance of the Danish auxiliaries, who were marching from the Netherlands." [Coxe.]
Crossing the river Neckar, Marlborough marched in a south-eastern direction to Mundelshene, where he had his first personal interview with Prince Eugene, who was destined to be his colleague on so many glorious fields. Thence, through a difficult and dangerous country, Marlborough continued his march against the Bavarians, whom he encountered on the 2d of July, on the heights of the Schullenberg near Donauwert. Marlborough stormed their entrenched camp, crossed the Danube, took several strong places in Bavaria, and made himself completely master of the Elector's dominions, except the fortified cities of Munich and Augsburg. But the Elector's army, though defeated at Donauwert, was still numerous and strong; and at last Marshal Tallard, when thoroughly apprised of the real nature of Marlborough's movements, crossed the Rhine. He was suffered through the supineness of the German general at Stollhoffen, to march without loss through the Black Forest, and united his powerful army at Biberach near Augsburg, with that of the Elector and the French troops under Marshal Marsin, who had previously been co-operating with the Bavarians. On the other hand, Marlborough re-crossed the Danube, and on the 11th of August united his army with the Imperialist forces under Prince Eugene. The combined armies occupied a position near Hochstadt, a little higher up the left bank of the Danube than Donauwert, the scene of Marlborough's recent victory, and almost exactly on the ground where Marshal Villars and the Elector had defeated an Austrian army in the preceding year. The French marshals and the Elector were now in position a little farther to the east, between Blenheim and Lutzingen, and with the little stream of the Nebel between them and the troops of Marlborough and Eugene. The Gallo-Bavarian army consisted of about sixty thousand men, and they had sixty-one pieces of artillery. The army of the Allies was about fifty-six thousand strong, with fifty-two guns." [A short time before the War of the Succession the musquet and bayonet had been made the arms of all the French infantry. It had formerly been usual to mingle pike-men with musqueteers. The other European nations followed the example of France, and the weapons used at Blenheim were substantially the same as those still employed.]