Siege of Vicksburg
The siege of vicksburg took place on the Mississippi river,led by Ulysses S. Grant.
The siege was led by Grant he wasn't General of the union army at the time until after this attack. It put his name out there because when president Lincoln heard that he didn't stop the siege until the fort surrender unconditionally. He wanted Grant as the general for the Union army.
This victory help fulfill the anaconda plan. Since they took over the whole Mississippi River and cut the Confederacy in half.