That's per PHB page 36 -- but not per DMG page 70.Raven Crowking said:Shouldn't this be "right flank or rear, assuming shield on the left arm"?
If you have tried, or watched, fighting on foot with weapon and shield, perhaps recollection will suggest that the shield is held up to one's front. Assuming the shield is on one's left arm, one's torso is either also facing the front or turned to the right. So, it might actually be a bit easier to block to the right flank than to the left.Flank Attacks: All flank attacks negate any defender armor class addition for shield.
You've got three "front" squares or hexes (or positions if not using a grid). Depending on the size of your shield, it counts against from one to three attacks per round.
I don't know whether this is mentioned in the AD&D books, but a cavalryman normally would be fighting to a flank of his horse. They would have different "front" facings, except for instance in a charge with lance.