BEAUREGARD, Pierre Gustave Toutant (1818-1893). Autograph letter signed ("G.T. Beauregard"), to ex-Union General Henry L. Abbot. New Orleans, 12 April 1886. 1 page, 8vo, small pinhole lower blank margin, some light ink smudging. Beauregard thanks abbot for the photograph of the Explosion at Flood Rock, NY on October 10th 1885. "I congratulate you and the other Officers engaged in that great enterprise."