Great Kings' War

Blurb

Great Kings' War is an English language science fiction novel by John F. Carr and Roland J. Green, a sequel to H. Beam Piper's Lord Kalvan of Otherwhen. It continues the story of Corporal Calvin Morrison after he is transported to another timeline by a Paratime conveyor. The book was released in two editions, one in 1985 and the revised and expanded edition in 2000 .
Having saved his new nation of Hos-Hastigos from destruction only last year, Calvin Morrison faces the House of Styphon in a new military campaign. Kalvan once more draws upon his knowledge of his home timeline's military history to meet a greater threat.