American Civil War: The First Battle of Memphis, a naval engagement fought on the Mississippi River, results in the capture of Memphis, Tennessee by Union forces from the Confederates.

The American Civil War was a civil war in the United States between the Union and the Confederacy, which was formed in 1861 by states that had seceded from the Union. The central conflict leading to war was a dispute over whether slavery should be permitted to expand into the western territories, leading to more slave states, or be prohibited from doing so, which many believed would place slavery on a course of ultimate extinction.

The First Battle of Memphis was a naval battle fought on the Mississippi River immediately north of the city of Memphis, Tennessee on June 6, 1862, during the American Civil War. The engagement was witnessed by many of the citizens of Memphis. It resulted in a crushing defeat for the Confederate forces, and marked the virtual eradication of a Confederate naval presence on the river. Despite the lopsided outcome, the Union Army failed to grasp its strategic significance. Its primary historical importance is that it was the last time civilians with no prior military experience were permitted to command ships in combat. As such, it is a milestone in the development of professionalism in the United States Navy.

The Mississippi River is the primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri. From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for 2,340 mi (3,770 km) to the Mississippi River Delta in the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 32 U.S. states and two Canadian provinces between the Rocky and Appalachian mountains. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana. The main stem is entirely within the United States; the total drainage basin is 1,151,000 sq mi (2,980,000 km²), of which only about one percent is in Canada. The Mississippi ranks as the world's tenth-largest river by discharge flow, and the largest in North America.