Flag of truce steamer captured.
Savannah, Aug. 11.
--The pickets on Wilmington Island report that the steamer Gen.
Lee, of Savannah, with a flag of truce, was fired on by Fort Pulaski, and captured yesterday.
Capt. Stuart, of Gen. Mercer's staff, and Capt. H. B. Frayzer, of Augusta, are among the captured.