Union Naval Blockade Begins

Where this fits. One week after Fort Sumter, the Union looked for ways to pressure the Confederacy without storming every Southern city at once. The blockade began in April 1861, months before ironclad warships fought at Hampton Roads.

Closing the coast. On April 19, 1861, President Abraham Lincoln declared a blockade of ports from South Carolina to Texas. The goal was to stop cotton exports, block weapons imports, and slow the Southern economy. Union wooden warships, not yet ironclads, patrolled the Atlantic and Gulf.

The Anaconda Plan. General Winfield Scott had sketched a broader strategy nicknamed the Anaconda Plan: squeeze the South by sea and split it by controlling the Mississippi River and its tributaries. Critics mocked the idea as too slow, but over time the blockade became one of the Union’s most powerful tools.

Blockade runners. At first the U.S. Navy was small and the coastline was long. Fast blockade runners, often built in Britain, slipped through at night with rifles, medicine, and luxury goods. As the war continued, the Union added more ships, used steam power, and captured key ports such as New Orleans in 1862.

Why navies mattered. Control of rivers and harbors fed armies on land. Without open ports, the Confederacy struggled to fund the war and import supplies. The blockade did not work perfectly, but it raised the cost of fighting year after year.

Where ironclads fit. In 1861 the blockade relied mostly on wooden ships. The famous duel between ironclads Monitor and Virginia came later, at the Battle of Hampton Roads in March 1862. That fight changed how navies were built worldwide; this event is the long chokehold that made harbor control worth fighting for.