The French and Bavarians were posted behind the little stream called the Nebel, which runs almost from north to south into the Danube immediately in front of the village of Blenheim. The Nebel flows along a little valley, and the French occupied the rising ground to the west of it. The village of Blenheim was the extreme right of their position, and the village of Luetzingen, about three miles north of Blenheim, formed their left. Beyond Luetzingen are the rugged high grounds of the Godd Berg and Eich Berg, on the skirts of which some detachments were posted, so as to secure the Gallo-Bavarian position from being turned on the left flank. The Danube secured their right flank; and it was only in front that they could be attacked. The villages of Blenheim and Luetzingen had been strongly palisaded and intrenched; Marshal Tallard, who held the chief command, took his station at Blenheim; the Elector and Marshal Marsin commanded on the left. Tallard garrisoned Blenheim with twenty-six battalions of French infantry and twelve squadrons of French cavalry. Marsin and the Elector had twenty-two battalions of infantry and thirty-six squadrons of cavalry in front of the village of Luetzingen. The centre was occupied by fourteen battalions of infantry, including the celebrated Irish brigade. These were posted in the little hamlet of Oberglau, which lies somewhat nearer to Luetzingen than to Blenheim. Eighty squadrons of cavalry and seven battalions of foot were ranged between Oberglau and Blenheim. Thus the French position was very strong at each extremity, but was comparatively weak in the centre. Tallard seems to have relied on the swampy state of the part of the valley that reaches from below Oberglau to Blenheim for preventing any serious attack on this part of his line. The army of the allies was formed into two great divisions, the largest being commanded by the Duke in person, and being destined to act against Tallard, while Prince Eugene led the other division, which consisted chiefly of cavalry, and was intended to oppose the enemy under Marsin and the Elector. As they approached the enemy, Marlborough's troops formed the left and the centre, while Eugene's formed the right of the entire army. Early in the morning of August 13th the allies left their own camp and marched toward the enemy. A thick haze covered the ground, and it was not until the allied right and centre had advanced nearly within cannon-shot of the enemy that Tallard was aware of their approach. He made his preparations with what haste he could, and about eight o'clock a heavy fire of artillery was opened from the French right on the advancing left wing of the British. Marlborough ordered up some of his batteries to reply to it, and while the columns that were to form the allied left and centre deployed, and took up their proper stations in the line, a warm cannonade was kept up by the guns on both sides.