The arrows weren't anything special, or as far as I know. However, the bows were special:



An attack of 8 with a extremely long range would be accurate.

Bit off topic, but in my opinion, the EB team was wrong to give the Indian longbowmen and the Cretans such a high attack and range. The Cretans used the worst kind of bows - self bows, although with high skill. The Indians used the longbow, the best of the self bows, but woefully inadequate (in power, range, velocity, ease & speed of loading) compared to the composite bows. The archers of the East should have had the best stats in EB.