Do you remember your source for this? It doesn't sound right. I thought most death/injury occurred when the losing army fled, and the victorious army hunted them down. Also, just mechanically, even moderately sized armies were at least a mile long across their front; there's no way that massed volleys could've been used across the whole front, or even, really, more than a small fraction of it.
> lead balls fired by early muskets were often more deadly than modern firearms
If slow lead balls are deadlier than fast jacketed bullets, then modern armies would use slow lead balls. Maybe slow lead balls are more dangerous when they hit, but less dangerous overall?
WRT muskets, they are slow to load and fire, inaccurate, low-range, the bullets move slow enough that you can see and dodge them - good for massed warfare during the transition from cold weapons to hot, but not at all for the modern battlefield. IIRC it was in battles during the US Civil War that rifles which were accurate over long distances and allowed a small number of soldiers to defend a position came to the forefront.
Deadliness also doesn't seem to be the selection criteria for modern weaponry. If it were, militaries would all be using chemical weapons, firebombing, nuclear bombs, hollow-tips, poisoning water supplies, etc., but they aren't. Killing soldiers can be a part of strategy, but from what I see usually more of the strategy is about controlling key locations and resources, and winning through logistics and politics, while destruction is largely strategic or symbolic.
Not sure if there was any factual evidence behind his theory, but I found this idea fascinating when I heard it.
See also https://en.wikipedia.org/wiki/Comparison_of_the_AK-47_and_M1...
* Infections
* Getting stabbed as you routed
But I don’t understand your logic about the arrows. The width of the line shouldn’t cause some sort of scaling issues. I mean, the army of archers would be limited in the sense that training a ton of archers and making a ton of arrows is expensive, but assuming it is possible to produce and supply that many archers, there’s no reason to think they couldn’t all carry their arrows to the front, right?
Eventually your guys run out of arrows of course, but getting them resupplied after the battle is the same logistics problem that you solved before the battle.
Secondarily, you need to use your (very expensive!) arrows effectively, and it's hard to see over the people in front of you to shoot someone in the distance. That means, practically, archers are just shooting the soldiers in front of them — soldiers in the nearest 100' or so. That'd only cover 3–500' of line. (This practical consideration was noted by my Military History teacher from his direct observation of battles in Africa.)
Where on Earth did you hear this?