The order was given, and the corps marched off, and presently took up their position between the river and the French regiment forming the extreme right flank of the advance. In extended order and taking advantage of every inequality of the ground, they pushed on, and after advancing a quarter of a mile, were brought to a standstill by a sudden outbreak of musketry fire at various points along the crest of a slight rise some six hundred yards in front of them. Taking cover behind a low wall running at right angles to the river, they opened a dropping fire in return. This, however, was at once stopped by the colonel, who himself went along the line. "Don't throw away a shot, lads," he said, "you may want every cartridge before you have done. It will be time enough to begin when they show in force over that crest." There was no more for the men to do than there had been when they were waiting for their turn to cross the bridge, but they were satisfied, now they were in the front line, and within shot of the enemy. The march had set their blood in circulation, and while two or three of each company kept a keen lookout over the top of the wall, the others laughed and joked, after first employing themselves in knocking holes through the wall, a few inches above the ground, so that they could lie and fire through if the enemy advanced. The musketry fire had almost ceased away to their right, and they hoped that Vinoy had established himself well out in that direction. Various were the conjectures as to why the advance had ceased on their own side. Some conjectured that Trochu's plan consisted only in crossing the river and then marching back again in order to accustom the troops to stand fire. One suggested that the general had come out without ink or paper with which to write his grandiose proclamations to the Parisians, and they were waiting until it had been fetched from his office. "What do you think, Henri?" Rene asked the lieutenant. "I should say," he said, gravely, "that when our advance came upon the real Prussian line of defence, they found it too strong to be carried. They must have known that they could never hold Champigny under the fire of our guns and forts, and used it only as an outpost. Of course it is from this side they would think it likely that we should try to break out, and they would certainly erect batteries to command all the roads. They have had nothing else to do for the last ten weeks."