Firehand
Preparing to travel through time in order to face a band of predatory aliens, Ross Murdoch plans to leap into the feudal period of Dominion, where he can help win a war that will bring defeat to the aliens.
Andre Norton
Andre Alice Norton (1912-2005) was an American science fiction and fantasy author (with some works of historical fiction and contemporary fiction) under the noms de plume Andre Norton, Andrew North and Allen Weston. Norton published her first novel in 1934, and was the first woman to receive the Gandalf Grand Master Award from the World Science Fiction Society in 1977, and won the Damon Knight Memorial Grand Master Award from the Science Fiction and Fantasy Writers of America (SFWA) association in 1983.
The Time Traders
The Time Traders is also known as Ross Murdock and Time War.
The Time Traders consists of seven books. The current recommended reading order for the series is provided below.