Future war fiction is mostly fantasy, and fortunately such stories seldom come true. But some do. One example was a book titled "Banzai!" Published in 1908 by Parabellum (nom de plume of Ferdinand Heinrich Grautoff, 1871-1935), it featured the improbable scenario of a Japanese naval sneak attack on Pearl Harbor.
The long-defunct American weekly magazine Liberty ran "Lightning in the Night," a 12-part serial novel by Fred Allhoff (1904-1988). In the final episode, which appeared Nov. 16, 1940, the U.S. emerged victorious in a war against Imperial Japan and Nazi Germany through the use of a nuclear weapon — this almost five years before the atomic bomb was developed!
Larry Bond and Jim DeFelice are two novels along in a series that spins a war between China and Vietnam. (Bond formerly collaborated with "techno-thriller" giant Tom Clancy.)