On the 29th of May Tallard, retiring from the dash to help Bavaria, was still at Altenheim, on the German bank of the Rhine. It was only on that day that he learnt from Villeroy that Marlborough had no idea of marching up the Moselle, but had gone on up the Rhine towards Mayence. Marlborough had crossed the Moselle and the Rhine on the 26th, but it took Tallard three days to know it. Tallard, knowing this, would not know whether Marlborough might not still be thinking of attacking Alsace: to make that alternative loom large in the mind of the French commanders, Marlborough had had bridges prepared in front of his advance at Philipsburg--though he had, of course, no intention at all of going as far up as Philipsburg. It was on June 3rd, as we have seen, that the foremost of Marlborough's forces were nearing the banks of the Neckar, and upon the 4th that anyone observing his troops would have clearly seen for the first time that they were striking for the Danube. But it was twenty-four hours before Tallard, who had by this time come down the Rhine as far as Lauterberg to defend a possible attack upon Alsace, knew certainly that the Danube, and not the Rhine, would be the field of war. All this time it was guessed at Versailles, and thought possible by the French generals at the front, that the Danube was Marlborough's aim. But a guess was not good enough to risk Alsace upon. By the time it was certain Marlborough was marching for the Danube--June 4th and 5th--Tallard's force was much further from the Elector of Bavaria than was Marlborough's, as a glance at the map will show. There was no chance then for heading Marlborough off, and the chief object of the English commander's strategy was accomplished. He had kept the enemy in doubt[3] as to his intentions up to the moment when his forces were safe from interference, and he could strike for the Danube quite unmolested. [Illustration: Map illustrating Marlborough's march to the Danube.] Villeroy at once came south in person, and joined Tallard at Oberweidenthal. The two commanders met upon the 7th of June to confer upon the next move, but at this point appeared that capital element of delay which hampered the French forces throughout the campaign, namely, the necessity of consulting with the King at Versailles. The next day, the 8th, Tallard and Villeroy, who had gone back to their respective commands after their conference, sent separate reports to Versailles. It was not until the 12th that Louis answered, leaving the initiative with his generals at the front, but advising a strong offensive upon the Rhine in order to immobilise there a great portion of the enemy's forces.