Was General William T Sherman in the Mexican War?

Answer 1

No he was not. While many of his compatriots saw service in the Mexican-American War, William T. Sherman was employed California, performing administrative duties for the then new State. He is notable for arriving at the town of Yerba Buena two days before it changed it's name to San Francisco and also for being part of the inspection of the state to verify if there was gold to be found there.

Answer 2

No, he was one of the few West Pointers who didn't. He was on a home posting.

That could have counted against him in terms of seniority and credibility in the Civil War. But he had connections in Washington, and perhaps more important, he made a good impression on U.S.Grant, who became a close friend and colleague, eventually promoting him to army commander.