General-in-Chief of the Union armies
Many US Civil War historians believe that General US Grant clearly influenced the outcome of the war, however, that his role did not determine the end result of the war. Until the nearly the very end of the war, Confederate armies were still able to take the field against the Union armies. Southern defeats prior to Grant being named as general in chief, actually influenced the way in which Grant began to conduct the war. This in no way reduces Grants standing as a successful general, it simply clarifies his role and its influence.
US Grant served in the Mexican War. His position was in the Quartermaster Corps. As an aside, Grant wrote later that he was against that war and saw it as a "land grab" by the US.
At the end of the US Civil War, General in Chief US Grant remained in that position. Later, President Andrew Johnson appointed US Grant to the position of secretary of war. Grant remained in that position until he was elected to the US presidency.
general of the Army
what did the US Grant do after the war
Ulysses S. Grant.
As might be expected, the Union had a number of officers with the rank of general in the US Civil War. At the end of the war, however, US Grant was in charge of the Union's fighting forces.
Robert E. Lee, CSA.
Once in position as the Union's general in chief, he designed an offensive strategy that he believed would end the US Civil War by the end of November of 1864.
Generals Lee and Grant were each in the Mexican War as US officers. Later they both were in the US Civil War as opponents.
General US Grant's first assignment in the US Civil War was in Missouri. In September of 1861 Grant took command of the Southeast Missouri District.
US Civil War General US Grant is given overall credit to have been the driving force that helped to end the US Civil War. In this effort he defeated the best Southern generals in the field, however, this must be viewed in light of the number of troops he had in any given battle.