Kingsnorth, Paul

One thousand years from now, after human civilization has collapsed, the members of a small religious community are the world's last human survivors. They are hunted by a force that draws nearer each day, and worry they will become extinct. However, the force offers them a veiled hope of survival: a place called Alexandria.

"After his sons are killed at the Battle of Hastings and his family and farm are destroyed by the Norman invaders, Buccmaster leads a group of fighters on a quest of revenge"--OCLC.