Quote Originally Posted by Sjakihata
Quite simple really. He means that if archers who use a high trajectory miss their shot, the arrow tends to go either infront of the intended target or behind it ie. hitting the ground in both cases. In lucky occasions the arrow will miss the intended target and hit somewhere else in the unit, this is not happening often though, due to high trajectory.
Slingers, on the other hand, use low trajectory. So when they sling on a target, say a guy in the front row, and 'miss' that guy, chances are that they will hit another guy in the 2nd or 3rd row. This is much higher than archers due to low trajectory.

and I agree completely with Kraxis.
Yep, but not only that.
If an arrow misses its target (man, as every archer targets a single man in TW) it is likely to the ground besides him, if lucky it will hit one of the guys around him.
A slingbullet on the other hand if it misses the target to either side will be presented with a much denser target in the form of depth and frontage. Even if it falls into a lane in the unit it is likely to hit a guy some way down the lane (the bullet is not likely to have come from a man who could look down the lane and see open land).

I'm surprised though that archers kill slingers easily. Historically it was the other way around. Archers hated the slingers, possibly because the bullets were almost invisible?
It must be noted that archers were usually more effective against shielded enemies, as the arrows could penetrate the shield if lucky, bullets couldn't. Also archers could be formed much tighter than slingers, so fire for effect would be much more effective from archers...