In front of him to the right a fellow fighter assumes a similar posture. In the center, two fighters face off over a third who is falling to one knee and appears to be incapacitated. The front facing fighter holds out an oval shield with umbo and carries his weapon back. His opponent caries a curved heater shield held natural somewhat closer, his weapon is pulled back in preparing to strike. On the far right a fighter is about to strike a fallen enemy with a classic sword blow.
All combatants are in full plate and most with open helms.
From Battle of Otterburn.