One of my players sent me this...
"Another good defense against arrows is a shield. Shields were used by archers and varied from the small Arabic round shield on the bow arm to the large Assyrian wicker shields carried by a shield bearer or the pavise of the crossbowman.
The archer's arm shield is an excellent defense. You can use it to actively block arrows, and sometimes it will manage to block arrows you did not see. But in light battles(they are not allowed in mixed battles) it is limited to fifteen inches in diameter and must be marked with the light fighters device, so as not to be mistaken for a heavy's shield. Basically a 15" round shiled on bow arm? what do you think?"
I think it sounds like a +1 dcv shield, requiring sheild skill, while firing with bow.