"Once, military actions were entirely two dimensional, confined to the surface of land and sea, but then submarines and aircraft added a third dimension, vastly extended by spaceflight. Now, consider that if time travel is possible, the fourth dimension of time opens up new possibilities for combat -- necessitating new defenses, new strategies and tactics. A battle that was once decisively won might be refought, or a narrow victory might be subtly tilted to the other side. Never mind the history books, they're only works in progress. It's zero hour, in whatever time stream, so grab your time-appropriate weapon--be it sword or ray blaster--buckle on your general issue timeporter belt, and follow the Time Troopers into action across strange aeons! Stories of time travel military science fiction by an all-star general staff including Robert Silverberg, Poul Anderson, Fritz Leiber, John C. Wright, H. Beam Piper, and more"--Page 4 of cover.