He had told the southern peace delegations he wouldn't reinforce any federal forts in the south, but sent the ship, Star of the West to Fort Sumter filled with supplies and troops. The southern states found out about it and decided that they couldn't allow the ship to resupply the fort. When the ship arrived they fired on her, hitting her three times and forcing her to retreat. These were the first shots of the Civil War. It's not a well known fact about the peace delegation and might impress your teacher. Do your research to make sure I am correct in the fine points.