Dawn was stealing down into the valley. Ganda Singh crept on all fours to the wall and peeped over. In a few minutes he returned and reported that there was nothing opposite the bridge but a mass of broken rock and metal. The guns had been destroyed. But the Kalmucks were scattered along the track between the bridge and the bend, crouching behind rocks and entrenchments which they had thrown up during the night. Apparently they were unaware of the descent of the aeroplane, and dreaded another attack by bombs. It was hardly light when a fierce bombardment broke out from the bend. Shells crashed upon the northern wall, and whistled into the deserted compounds, scattering earth in all directions, and filling the air with noisome fumes. "We’re safe here for the present," said Bob, whose face looked pinched and pale in the light of the morning. "But when they find we don’t reply, and there’s no other attack from the aeroplane, they’ll bring their guns along and pound us from the opposite bank. When it gets too hot we must go into the galleries. Before they can repair the bridge and cross, Endicott ought to be here." He had scarcely spoken when a shell plumped into the house, and set it on fire. The garrison were enveloped in a mantle of smoke. But as the smoke drifted across the river, the Kalmucks, taking courage from the quiescence of the defenders, rushed forward from their shelters and began to throw a light framework over the torrent between the rock in midstream and the end of the ruined bridge. The sudden cessation of the bombardment gave Bob an inkling of what was to come; next moment loud yells from beyond the river made it clear. "They’re coming at us," he said quietly to Lawrence. "They must have made a bridge. We can’t retreat now. You must do your best, old chap." Though Lawrence begged him to remain on his chair, Bob got up and accompanied the little band as they rushed towards the river wall to meet the storming party. They were no more than thirty; the track swarmed with the enemy. The improvised bridge would not support more than thirty at a time, so that the attackers and the defenders of the wall were equal in point of number; but the Kalmucks had posted many sharpshooters in the rocks above the track, who could fire over their comrades’ heads and pick off the garrison manning the wall and the gap where the end of the drawbridge had been.