The South did no such thing. Lincoln sent a war fleet that was going to attack them. Lincoln launched the war. No war fleet, no war.
Lincoln also had a plan to start the war in Pensacola, and but for the intervention of Captain Meigs, he would have succeeded in starting the war there.
No, Jefferson Davis told Braxton Bragg he was going to start war at Fort Sumter and Fort Pickens as soon as he was ready, even if that lost him certain "advantages".
Davis just didn't care who started the war, he was happy to do it to protect Confederate "integrity".
Sure, Lincoln's resupply ships provided a convenient excuse, but Davis didn't one, he said so himself:
DiogenesLamp: "Lincoln also had a plan to start the war in Pensacola, and but for the intervention of Captain Meigs, he would have succeeded in starting the war there."
No, Jefferson Davis was perfectly happy to start war at Fort Pickens too: