What fort did Lincoln try to resupply during 1861 sparking the Civil War?

Fort Sumter - it was one of the last two Union-controlled fortifications in Confederate South Carolina soil at the beginning of the war, and Lincoln was determined to keep it in order to show he was sincere in preserving the Union, but if he defeated the invading Confederates militarily, he might be the aggressor to a war. He opted for the middle path, and chose to send a ship with provisions instead of arms.