"The Rev. E. P. Roe, of West Point, lectured last night before a fair audience, at Harrington's Opera House, under the auspices of Prescott Post No. 1, G.A.R., on 'Secret Service at the Front; or Scouting and Guerrillas.' During the war, said the speaker, the northern people regarded guerrillas as irresponsible bands of outlaws, living by violence and plunder, and while leaning to and assisting the rebels, ready to murder and rob without much regard for either side. The majority of the guerrillas were, no doubt, as bad as generally supposed, but there were among them trusty and intelligent scouts, whose employment was to trace out the position and movements of the Union army, and who, no matter how much robbing and murdering they might do on their own account, never lost sight of the main object of their service. The acuteness of these scouts and the various disguises which they assumed were more than surprising. As a division of the Union army passed along, an old citizen might have been seen building a rail fence. Surely that ancient-looking farmer knows nothing, the passing troops would readily think. But under that old felt hat gleamed a watchful eye and listened attentive ears, observing and hearing everything worthy of remark. As soon as the army passed, he throws down his rails and slips off to the swamp, mounts a fleet horse, and soon the numbers, destination and condition of the Union division are reported at the nearest rebel headquarters. Sometimes the woods on both sides of the marching column swarmed with prowling guerrillas; sometimes an affable stranger in Union colors would approach, enter into conversation with the weary straggler, gain all the information he could, and then shoot down his informant. They were very bold in their operations. One day an orderly was riding with important despatches far within the Union lines, when he was startled by a mounted rebel, who made his appearance from the woodside, and who, presenting a pistol at his breast, demanded his arms and despatches. After, as he imagined, cleaning out the orderly, the rebel invited him to come along and accept a little Southern hospitality. The scout rode a little forward, and as he did so, a quiet grin played stealthfully over his furious countenance; a little pistol was withdrawn from a side pocket, the cold muzzle applied to the rebel's ear, and in a very few moments the rebel was disarmed and on his way to a Northern prison. But the bold deeds of the rebels in scouting through the Union lines paled before the achievements of General Sharpe and his bureau of military information. The promotion of this bureau was recommended by General Butterfield to General Hooper, in 1863, for the purpose of ascertaining the numbers, positions, and intentions of the enemy.