Confederacy, Immortal "Confederate 50" Exchange Letter, letter datelined "Headquarters, Department of the South, Hilton Head, S.C., August 1st, 1864" from Union Maj. Gen. John G. Foster to Rear Admiral J. Dahlgren stating "I have the honor to inform you that the Government has give me authority to exchange the rebel prisoners of war in this Department for those of our officers confined at Charleston. Arrangements have been made to make the exchange in Charleston Harbor between Fort Moultrie and Battery Putnam at 10 o'clock on Sunday morn", a Very Fine and highly important historical letter.; signed by Foster. Estimate  $2,000 - 3,000. The Immortal 50 were Union prisoners of war confined at Charleston being used as human shields against Federal bombardment of the city. General Foster was in command of the Federal Forces at Hilton Head. Following this letter, he assembled 5 Rebel Generals, 15 Colonels, 15 Lieutenant Colonels, and 15 Majors that would be exchanged. $0 (Image)