MTW had horribly un-realistic range damage. RTW does a h@ll of a lot better.

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7. Fire projectiles. However, their effect is extremely overdone and they work in rain.


1). Their effect is not overdone. Burning pitch, tar, and oil was heated so hot that it would set any clothe on the persons body aflame, and some times even skin.
2). With the exceptions of the Romans (who some times used cloth dipped in olive oil wrapped around their shafts ) most people used pitch and tar which burned in pouring rain.