He found it necessary because Lincoln was only transferring food to the Northern army at the fort. However, once the ship came to the fort, it was believed (or assumed) by the south that inside the ship were supplies of weapons, soldiers, anything besides food. The South then opened fire, catching the North off guard and the first battle of the Civil war began.
Because they didn’t want to
An example....um well ok "One day there was a guy a and he got lost and then another guy found him after a huge amount of time searching" sorry if this didn't help!
