From Ohio History Central
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Following the Battle of Cold Harbor, Grant advanced towards Petersburg, Virginia, a city located approximately twenty miles south of Richmond. A siege resulted, with the Union's Army of the Potomac virtually surrounding the South's Army of Northern Virginia in Petersburg. The siege lasted for almost ten months. The Northerners finally drove the Confederates from Petersburg in early April 1865. The Army of Northern Virginia surrendered on April 9, 1865.