The Civil War began after Confederate forces attacked Union soldiers at Fort Sumter in South Carolina in April 1861. In response, Lincoln called for militiamen to put down the rebellion, which caused four more Southern states to secede from the Union. The North had advantages in population, transportation infrastructure, and industrial capacity. The South relied on defending local territory and hoping to wear down the North. Both sides developed strategies - the North sought to blockade Southern ports and control the Mississippi River, while the South aimed to capture Washington D.C. and gain foreign support through cotton exports. As both sides prepared for war, volunteer armies were formed though troops lacked supplies, training, and standard uniforms.