Upon the 13th of June these great captains met and conferred also with the Margrave, Louis of Baden, who commanded all the troops in the hills, and who was to be the third party to their plan. He was a man, cautious, but able, easily ruffled in his dignity, often foolishly jealous of another's power. He insisted that Marlborough and he should take command upon alternate days--he would not serve as second--and in all that followed, the personal relations between himself and Marlborough grew less and less cordial up to the eve of the great battle. His prudence and arrangement, however, his exact synchrony of movement and good hold over his troops, made Marlborough's decisions fruitful. Upon the 14th of June the passage of Marlborough's column over the hills between the Rhine and the Danube began. Baden went back to the command of his army, which already lay in the plain of the Upper Danube, and awaited the arrival of Marlborough's command, and the junction of it with his own force before Ulm. A heavy rain, drenched and bad roads, marked Marlborough's crossing of the range. It was not until the 20th that the cavalry reached the foot of the final ascent, but in two days the whole body had passed over. It was thus upon the 22nd of June that the junction between Marlborough and Baden was effected. From that day on their combined forces were prepared to operate as one army upon the plain of the Upper Danube. They stood joined at the gates of Ulm, and in their united force far superior to the Franco-Bavarians, who had but just escaped Baden's army, and who lay in the neighbourhood watching this fatal junction of their rivals. I say, "who had but just escaped Baden's army," for it was part of the general plan (and a part most ably executed) that not only should the seat of war be brought into the valley of the Upper Danube by Marlborough's march to join Baden, but, as a preparation for this, that the army of the Elector, with his French allies under Marcin, should be driven eastward out of the mountains and cut off from the main French forces upon the Rhine. This chasing of the Franco-Bavarians down on to the Danube and out of the Black Forest was begun just after the spirited piece of generalship by which Tallard had, as we have seen, reinforced the Elector of Bavaria in the middle of May. That rapid and brilliant piece of work had been effected only just in time. Hardly was it accomplished when Baden's force in the mountains marched, as part of Marlborough's general plan, against the Elector, with the object of forcing him back into the Danube valley at full speed. It was on the 18th of May that the British regiments were crossing the Meuse, and the advance upon the Danube had begun.