American Civil War: Mobile, Alabama, falls to the Union Army.

Mobile is a city and the county seat of Mobile County, Alabama, United States. The population was 187,041 at the 2020 census and estimated at 204,689 following an annexation in 2023, making it the second-most populous city in Alabama. The Mobile metropolitan area, with an estimated 412,000 people, is the third-most populous metropolitan area in the state.

The Union was the central government of the United States during the American Civil War. Its civilian and military forces resisted the Confederacy's attempt to secede following the election of Abraham Lincoln as president of the United States. Lincoln's administration asserted the permanency of the federal government and the continuity of the United States Constitution.

April 12 is the 102nd day of the year in the Gregorian calendar; 263 days remain until the end of the year.