What war did general Joseph e johnston fight for?

In the Civil War, he was the most senior of the US Army Generals who resigned to join the Confederates, although ranked only fourth, for the dubious reason that his most recent service was on the staff and not in the line.

He was a highly talented soldier who won the first battle of the war (Bull Run). But he quarrelled constantly with President Davis, and was eventually removed from hgh command.

His memoirs are perhaps the most unreadable of any - surprising in such a highly educated man.