What is the name of the event where union army under general Ulysses S. Grant gained greater control of the Mississippi River?

The event is known as the Siege of Vicksburg, which took place from May 18 to July 4, 1863. It was a pivotal battle during the American Civil War, where General Ulysses S. Grant's Union forces successfully surrounded and besieged the Confederate stronghold of Vicksburg, Mississippi. The Union victory effectively gave them control of the Mississippi River, splitting the Confederacy in two.