The siege of Vicksburg, Mississippi by Union forces under Major General Ulysses S. Grant began 150 years ago on May 18, 1863. Confederates forces would surrender the fortress city after 40 days, effectively yielding control of the Mississippi River to the Union.
Map of the Siege of Vicksburg, Miss., By the U. S. Forces Under the Command of Maj. Genl. U. S. Grant, U. S. Vls., Maj. F. E. Prime, Chief Engr. Surveyed and constructed under direction of Capt. C. B. Comstock, U.S. Engrs., and Lt. Col. J. H. Wilson, A. I. Genl. 1st Lt., Engrs….Drawn by Chs. Spangenberg, Asst. Engr., 08/20/1863