My troubles with time

"What happens when an inept physics professor goes back to December 1941 in his time machine, seeking to become a national hero by destroying the Japanese fleet which attacked Pearl Harbor? Just about everything, including being arrested and sentenced to death by a U.S. Navy Court Martial for mistakenly sinking the Japanese vessesl prior to their launching their attack. The surprise ending relating how the professor escapes his fate, provides one of the happiest endings of any book"--Back cover.