How did the actions of union generals grant and sherman affect the outcome of the civil war?

The actions of the Union generals Grant and Sherman did have a direct effect on the outcome of the civil war.During this civil war general Grant was cosidered the best soldier and he did prove his name right by capturing both the Fiort Donelson and Vicksburg.One the other hand General Sherman marched through Georgia and Carolinas and this resulted in weakening the enemies logistically and psychological.This team is considered the main reason behind the Union winning of the civil war.