We forget what these men endure--their risks, their privations, their fatigues, their anxieties, _their battles with themselves_, when sleep--more insidious than even the lurking enemy in the bush--tugs at their heavy eyelids, and their overwearied senses are barely held to their allegiance by the strongest mental effort. The soldier who rushes to the charge at the command of his officer is animated by the shouts of his comrades, inspirited by the sounds of martial music, and full of the ardor and confidence which the consciousness of being intelligently led and loyally supported engenders. He sees his adversaries; he fights in an open field; his fate is to be decided by the ordinary chances of honorable war. Not so the picket-guard. He is surrounded by unseen dangers. The gleam of his bayonet may, at any moment, draw upon him the fire of some prowling assassin. If he hears a rustling among the leaves, and inquires, "Who goes there?" the answer may be a ball in his heart. A GALLANT DEED AND A CHIVALROUS RETURN. In the recent movement of Stoneman's Cavalry, the advance was led by Lieutenant Paine, of the 1st Maine Cavalry. Being separated, by a considerable distance, from the main body, he encountered, unexpectedly, a superior force of rebel cavalry, and his whole party were taken prisoners. They were hurried off as rapidly as possible to get them out of the way of our advancing force, and, in crossing a rapid and deep stream, Lieutenant Henry, commanding the rebel force, was swept off his horse. As none of his men seemed to think or care any thing about saving him, his prisoner, Lieutenant Paine, leaped off his horse, seized the drowning man by the collar, swam ashore with him, and saved his life, thus literally capturing the captor. Paine was sent to Richmond with the rest of the prisoners, and the facts being made known to General Fitz-Hugh Lee, he wrote a statement of them to General Winder, Provost-Marshal of Richmond, who ordered the instant release of Lieutenant Paine, without even parole, promise, or condition, and, we presume, with the compliments of the Confederacy. He arrived in Washington on Saturday last. This act of generosity, as well as justice, must command our highest admiration. There is some hope for men who can behave in such a manner.