...of the 21st and on the early morning of the 22d, General Brannan marched with all of his troops except the Forty-eighth New York and two companies of engineers, immediately up the road leading to Old Pocotaligo . The force detached was sent by boat up the Broad, and thence up the Coosawhatchie to destroy the railroad bridge over the latter river, where the main column, in case of victory at Pocotaligo, sho...