At Shiloh, Sherman commanded part of Grant’s army and although surprised by the Confederate assault early on, did well during the defensive fighting of the first day. Praised by Grant, he was soon made a Major General. Sherman was also instrumental in persuading Grant to remain in the army during his difficulties with Halleck during the advance on Corinth, Mississippi.
On the surface, they were very different, but the differences never hurt their friendship. Sherman was nervous. Grant was as calm, Sherman was active and explosive, Grant was calm and unhurried. Grant and Sherman were an effective, lethal combination because they were so different. They formed an equal balance—an offset of the positives and negatives of each other.