It could only be a question of delay. Lobau had but 10,000 against the 30,000 which Bulow could ultimately bring against him when all his brigades had come up; but delay was the essential of the moment to Napoleon. To ward off the advancing Prussian pressure just so long as would permit him to carry the Mont St Jean was his most desperate need. Lobau met the enemy, three to two, in the hollow of Plancenoit,[24] was turned by such superior numbers, and driven from the village. All this while, during the Prussian success which brought that enemy's reinforcement nearer and nearer to the rear of the French army and to the Emperor's own standpoint, the wasted though magnificent action of the French cavalry was continuing against Wellington's right centre, west of the Brussels road. Kellerman had charged for the third time; the plateau was occupied, the British guns abandoned, the squares formed. For the third time that furious seething of horse against foot was seen from the distant height of the Belle Alliance. For the third time the sight carried with it a deceptive appearance of victory. For the third time the cavalry charge broke back again, spent, into the valley below. Ney, wild as he had been wild at Quatre Bras, failing in judgment as he had failed then, shouted for the last reserve of horse, and forgot to call for that 6000 untouched infantry, the bulk of Reille's Second Corps, which watched from the height of the French ridge the futile efforts of their mounted comrades. Folly as it was to have charged unbroken infantry with horse alone, the charges had been so repeated and so tenacious that, _immediately_ supported by infantry, they might have succeeded. If those 6000 men of Reille's, the mass of the Second Army Corps, which stood to arms unused upon the ridge to the west of the Brussels road, had been ordered to follow hard upon the last cavalry charge, Napoleon might yet have snatched victory from such a desperate double strain as no general yet in military history has escaped. He might conceivably have broken Wellington's line before that gathering flood of Prussians to the right and behind him should have completed his destruction. But the moment was missed. Reille's infantry was not ordered forward until the defending line had had ample time to prepare its defence; until the English gunners were back again at their pieces, and the English squares once more deployed and holding the whole line of their height. It is easy to note such errors as we measure hours and distances upon a map. It is a wonderment to some that such capital errors appear at all in the history of armies. Those who have experience of active service will tell us what the intoxication of the cavalry charges meant, of what blood Ney's brain was full, and why that order for the infantry came too late. Of the 6000 infantry which attempted so belated a charge, a quarter was broken before the British line was reached, and that assault, in its turn, failed.