"There isn't a ghost of a chance that we'd be put on post up in officers' row. The oldest and keenest soldiers will be put on that duty every night." "Oh, I suppose so," sighed Hal. "Of course rookies are just rooks. We'll get the post down by the commissary stores, where a wagon train would be needed for stealing anything really worth money." At guard mount the next morning both recruits turned out spick and span. Knowing that they could not expect to get any important posts for night tours both boys hoped to be selected by the officer of the day for orderly duty. But two older soldiers were chosen for that. When guard mount was over Sergeant Hupner, as commander of the guard, marched the new guard over to the guard-house, where the old guard was relieved. This was the first time that the rookies had been detailed to guard duty since joining their regiment. No matter to what inconsequential posts they might be assigned both were full of determination to show themselves model sentries. During the day Hal and Noll, who were assigned to the same relief, had two tours. The first was in officers' row; the second, which ended just before dark, was down at the main entrance of the post. Then followed some hours for leisure and sleep. "You men will go on post again at two in the morning," announced Corporal Sanders, who was in command of the relief to which the rookies belonged. Punctually that relief was turned out, aligned, inspected and instructed. "Post number three, Private Overton. Post number four, Private Terry," ran the corporal's orders. "Post number five----" And so on. Hal's heart was already beating high with hope. He had the post along officers' row, Noll the one just beyond. "All sentries will exercise unusual vigilance," announced Sergeant Hupner, as commander of the guard. "This applies especially to the sentries on posts number three and four. But let no sentry, anywhere, allow his whole attention to wander from his duties for an instant. Corporal, march the relief." "Attention," called Corporal Sanders on receiving this order. "Right shoulder arms! By twos, left march!" Three minutes later the man on post three had been relieved, Hal having been dropped into his place. It was just after two o'clock in the morning when Private Hal Overton began to pace his post, watching the relief vanish in the darkness in the direction of post number four. Then he heard a sentry's hail: "Halt! Who goes there?" "The relief." "Advance, relief." After that, the steps of the marching party died off in the distance. In the darkest part of the moonless night Hal walked up and down before the officers' quarters. But he did more than walk. Making his own steps as noiseless as possible Hal felt that he was truly "all ears and eyes." Thus some twenty minutes went by. Then, suddenly, just as Hal had passed the north side of Captain Ruggles' quarters the young sentry halted like a flash.