i Register
In some senses, battailant is marked as obsolete. Watch for register when choosing this word.
adj
Prepared for battle; combatant; warlike.
An Elephant[…]That on his backe did beare (as batteilant) A gilden towre.
noun
A combatant.
he presently thought that he was dead, and that those battaillants that fought so eagerly in the Room, had slain him