During the American Civil War, Mobile was a Confederate city. The first submarine to successfully sink an enemy ship, the H. L. Hunley, was built in Mobile. One of the most famous naval engagements of the war was the Battle of Mobile Bay, resulting in the Union taking possession of Mobile Bay on August 5, 1864. On April 12, 1865, three days after Robert E. Lee's surrender at Appomattox Courthouse, the city surrendered to the Union army to avoid destruction after Union victories at nearby Spanish Fort and Fort Blakely. Mobile Cotton Exchange and Chamber of Commerce building, completed in 1886. On May 25, 1865, the city suffered great loss when some three hundred people died as a result of an explosion at a federal ammunition depot on Beauregard Street. The explosion left a 30-foot (9 m) deep hole at the depot's location, sunk ships docked on the Mobile River, and the resulting fires destroyed the northern portion of the city. Federal Reconstruction in Mobile began after the Civil War and effectively ended in 1874 when the local Democrats gained control of the city government. The last quarter of the 19th century was a time of economic depression and municipal insolvency for Mobile. One example can be provided by the value of Mobile's exports during this period of depression. The value of exports leaving the city fell from $9 million in 1878 to $3 million in 1882. http://en.wikipedia.org/wiki/Mobile,_Alabama