Louisa in Civil War. River traffic caused Union forces under Gen. James A. Garfield, 20th U.S. President, to occupy Louisa Dec. 1861. CSA troops attempted capture March 12 and 25-26, 1863. Southern partisans raided area Nov. 5, 1864, burning houses and 2 steamers, and looting stores. Fort Bishop, USA, completed here just as war ended in 1865. Also called Fort Gallup and Fort Hill. Erected October 4, 1962.