O

Obscurement

Obstacles, in generating a battlefield

on the battlefield

Offensive disarm

Oil

One or two-handed weapons

One-handed weapons used twohanded

One-handedweapon style specialization

Open-faced helm

Opposed rolls

Optional AD&D rules

Oriental weapons

Outside as a battlefield

Outside attack in dueling

Overbearing

	a mounted character
	during overruns

Overruns

	with chariots
	with wagons