11th. _Scarlet_.--The horse-artillery returned through Scarlet on the Glendarule road; hideous confusion reigns; were the enemy to fall upon us now, the best opinions regard our position as hopeless. Authentic news has been received of the desertion of Cinnabar. _Sandusky_.--The enemy has again appeared, threatening Mar, and the column moving to the relief of the Yolo column has stopped in its advance in consequence. General Stevenson moved out a column with artillery, and crushed a flanking party of the enemy's great centre army on Scarlet, Garrard, and Savannah road; no loss was sustained on our side; the enemy's loss is officially calculated at four hundred killed or wounded. _Scarlet_.--At last the moment has arrived. The enemy, with a strong column of horse and horse-artillery, occupied Grierson this morning. This, with his Army of the Centre moving steadily forward upon Garrard, places all the troops in and around this place in imminent danger of being entirely cut off, or being forced to retreat before overwhelming forces across the Blue Mountains, a course, according to all military men, involving the total destruction of General Potty's force. Piffle's whole corps, with the heavy artillery, continued its descent on the left bank of the Sandusky river, while Potty, dashing through Scarlet at the hand-gallop, and among the cheers of the populace, moved off along the Grierson road, collecting infantry as he moved, and riding himself at the head of the horse-artillery. NOTE.--General Potty was an airy, amiable, affected creature, the very soul of bravery and levity. He had risen rapidly by virtue of his pleasing manners; but his application was small, and he lacked self-reliance at the Council Board. Piffle called him a parrot; he returned the compliment by calling Piffle "the hundred-weight of bricks." They were scarce on speaking terms. Half an hour after, he had driven the fore-guard of the enemy out of Grierson without the loss of a trooper on our side; the enemy's loss is reckoned at 1,600 men. I telegraph at this juncture before returning to the field. So far the work is done; Potty has behaved nobly. But he remains isolated by the retreat of Piffle, with a large force in front, and another large force advancing on his unprotected flank.