The Reorted Mutiny in Washington.
--The report of the shooting of four hundred Federal soldiers, in Washington
, noticed yesterday, was brought to this city in a letter to a distinguished Marylander
, by a gentleman who managed to elude the vigilance of Lincoln
's hirelings, and escape into Virginia
.--The story goes that McClellan
contemplated an advance movement a few days ago, when one regiment mutinied; that they were tried by drum-head court-martial, and the ringleaders shot, as above stated.