Never Sound Retreat

Swept from America's Civil War to a strange planet dominated by Hordes who treat humans as "cattle", Andrew Keane and his soldiers have fought ten long years to free the oppressed humans from the brutal rule of the nomadic Hordes.  Now ten years later, the situation has worsened: a member of the Bantag horde has come through the mysterious channel of light to this planet from a world with the equivalent of Earth's 20th century technology.  With the number of warriors overwhelmingly in the Bantags' favor and their advanced technological knowledge, Keane and his officers must use every trick possible -- as well as having their genius Chuck Ferguson devise more advanced weapons and aircraft -- to keep from being annihilated.

A fast-paced and moving picture of survival against seemingly impossible odds.