..., Va.: A soldier of ours, James A. Walker, company H, Second Maryland regiment, captured in the attack upon the train at the Moorfield and Alleghany Junction, on the third instant, by the enemy under General Fitz-Hugh Lee , escaped when near Brocks's Gap, on the fifth instant, and reported to me this morning. He informs me that thirteen of the enemy were killed and twenty wounded, in the skirmish. He also states th...