This is a broad question, and I am going to address one reason of perhaps many. He was willing to let men die. Sounds fairly harsh, I know. read more
Far from perfect, Grant made tactical mistakes often. But he understood the nature of trench warfare before any other general (Lee included!) had, and adjusted his strategy accordingly. That's what made him more successful. read more
Although Grant made his reputation in the West with some major victories he was also successful in the East against General Robert E. Lee and the Army of Northern Virginia. Based on the circumstances he faced in Virginia, he was forced to use siege tactics to weaken the Confederates. read more