Joining by Johanna Lindsey

Joining - Wulfric de Thorpe and Milisant Crispin were betrothed at Milisant's birth.  When they were children, they had an altercation that left them both not wanting to meet the other again.  After several years of going to war to avoid marraige, Thorpe is finally forced to accept Milisant as his wife.  Neither party wants to go through with the marraige.  While they are fighting each other and their feelings, another party is trying to prevent their union.