Nightwatch on the Hinterlands
K. Eason
Enter a Soldier. Later: Enter Another
Robert Silverberg
On The Slopes Of Vesuvius
Robert A. Heinlein
The Breath of God
Harry Turtledove
Opening of the World (2)
Red Reckoning
James A. Hunter
Yancy Lazarus Series (6)
Red Reckoning (Yancy Lazarus Book 6)