The little gunboat was powered by two locomotive engines with "cylinders bolted to the top of and axis parallel to" her boiler—also from a railway locomotive. During 1862 A. B. Seger served as a dispatch boat, commanded by Acting Master I. C. Coons. As the Federal Flotilla under Lt. Comdr. Buchanan proceeded up Atchafalaya Bay on 1 November 1862, A. B. Seger was run aground and abandoned near Berwick Bay. She was then seized and placed in service by the Union.[1]
The ship was a side wheel steamer of 30 tons, 55feet long and mounting two guns.
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