If you only have 1 point to shield, it is probably useless. Generally, 1 point in anything does not do much. Your shield will break with 1-2 hits of basically any melee over level 15's, and may break after 4-5 arrows(which will probably happen if you're chasing after archers with only 3 ath. You also won't really be able to pick up other people's shields in battle while only using 1 shielding.
If you're going to use a shield, I'd recommend at least 3 skill to dedicate to blocking arrows.
Otherwise, just try to hide behind your teammates. It's probably best to keep that extra IF to survive one extra hit.