Then, at half-past two precisely, the battle began;[352] Gérard vigorously attacked Ligny,—Vandamme and Girard, St. Amand. With equal vigor did the Prussians defend their positions. The engagement immediately became very hot, and very sanguinary. Both sides fought with singular determination. In less than an hour Napoleon was convinced that he had more than a single corps to deal with,—as he had written to Ney,—it was an army. The success, therefore, could be made more decisive than he had at first thought possible, if only at the proper time Ney’s coöperation could be secured. Without that coöperation, indeed, he was practically sure of victory; it was plain to him that the Prussians in the villages of Ligny and St. Amand and its neighboring hamlets, and on the heights in the rear of these villages, were becoming exhausted, and were suffering terribly from the fire of his guns, to which their position on the heights exposed them;[353] he knew that when the proper moment arrived he could defeat them; but he wanted something more than a defeat; he saw that the rout or capture of this part of the Prussian army was a certain thing if Ney could only make that movement from Quatre Bras upon their right and rear, of which he had spoken in his 2 o’clock order. Hence at a quarter-past three Soult wrote to Ney again,[354] urging him to manœuvre at once, so as to envelop the enemy’s right, and to fall on his rear. He told him that the Prussian army was lost if he acted vigorously; that “the fate of France was in his hands.” “Thus,” the order proceeds, “do not hesitate an instant to make the movement which the Emperor orders, and direct yourself on the heights of Brye and St. Amand to assist in a victory perhaps decisive.” The officers who carried these orders had some thirteen miles to ride, about six miles on cross-roads, as far as Gosselies, and the remainder on the great Brussels turnpike, on which d’Erlon’s troops were marching towards Frasnes. Their errands could not have been performed in less than two hours,[355] and as a matter of fact they required three hours. Napoleon could hardly have expected the first order to reach Ney much before 5 P.M., and the second hardly before 6 P.M. The distance from Quatre Bras to Marbais, where the road branches off from the Namur turnpike in the direction of Wagnelée, is nearly four miles. If then at 5 o’clock it should be in Marshal Ney’s power to execute the 2 P.M. order, his troops might be looked for or heard from in the direction of Marbais about 7 o’clock. If he should be unable to obey the 2 o’clock order, but should be able to execute the 3.15 order, his movement down the Namur road might be looked for about 8 o’clock.