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In Janissaries, the leader is a United States Army officer from the Cold War period, Captain Rick Galloway, who along with his platoon-sized unit of soldiers primarily from the U.S. are abducted from a CIA-run operation against Cubans in the fictional tropical African country of Sainte-Marie by a flying saucer. The beings abducting them present themselves as rescuers from a hopeless situation where Galloway's unit is about to be overrun by Cubans in a night assault, the aftermath of which is expected to be the deaths of all. Afterwards, the human soldiers have the option of serving the aliens in a special situation involving a more primitive planet on which there are humans living in medieval conditions. The soldiers are expected to be able to use their superior weapons and tactics to conquer part of the planet.

The adventure begun in Janissaries continues in Clan and Crown.

For the first few years, Rick Galloway and his band of mercenaries were doing well just to survive. They'd been swept off a hilltop in Africa by a flying saucer and deposited on an alien world where the other inhabitants were human -- but from various and unfriendly periods of history, all collected by flying saucer raids. Rick has faced facts: this place is going to be home, permanently. To create a safe society for themselves and the families they are gradually building, they need to do more than just survive; they must convince the others that a unified, peaceful society is better than a collection of warring tribes. Force would not be Rick's chosen method of persuasion, but on a planet where the other dominant culture is one brought straight from ancient Rome, force may be the only way.

The adventure begun in "Janissaries" continues.

Kidnapped from Earth as they were about to die in battle, Rick Galloway and his band of mercenaries, like the other human slaves on the planet Tran, will not be missed. Subjects of the Shalnuksi slave masters, they are forced to harvest the priceless drug surinomaz. Now, even as slaves, Earth's transplanted warriors are locked in battle against each other. But an epoch is ending. As the Demon Star sweeps toward its devastating apex, the slave masters flee the planet to await its annihilation in safety. Soon all life on the planet will cease, leaving it ripe for repopulation.