The Forever War by Joe Haldeman. Not exactly “time travel,” at least not in the traditional sense.
The protagonist is a human soldier fighting a war in space. Because of the time dilation from traveling to/from the battles, he experiences massive jumps in time and human culture/evolution, all while he is serving in the military during a war in space that lasts a thousand years.
The Forever War by Joe Haldeman. Not exactly “time travel,” at least not in the traditional sense.
The protagonist is a human soldier fighting a war in space. Because of the time dilation from traveling to/from the battles, he experiences massive jumps in time and human culture/evolution, all while he is serving in the military during a war in space that lasts a thousand years.