What did general Sherman finally accomplish in 1865 that the navy could not and following his famous match to the sea?

In 1865, General William Tecumseh Sherman accomplished the capture of Savannah, Georgia, effectively cutting through the Confederacy and crippling its resources and morale. His "March to the Sea" demonstrated a new kind of warfare that targeted not just enemy forces but also infrastructure and civilian support, a strategy the Navy could not implement effectively on land. This campaign significantly contributed to the Union's victory by disrupting Confederate supply lines and demonstrating the futility of continuing the war. Sherman's tactics showcased the shift toward total war, which played a crucial role in hastening the end of the Civil War.