The Britannia's Fist Trilogy is an alternate history series by Peter G. Tsouras about an Anglo-French intervention into the American Civil War in 1863 and the global repercussions of such a conflict. The first and second volumes, and , were released relatively close together in 2008 and 2010 respectively. The final volume, , was released in 2015 and does not feature the extensive casualty reports seen in the first two novels.