Posts: 1,504 Location: Brisbane, Australia
Sat 29 Jun, 2013 7:37 pm
As said above, just look at the casualty counts in the famous English "longbow victories", or the effectiveness of archery at Flodden.
Crécy,
Poitiers, and
Agincourt: less than one armoured soldier killed per archer (even if archers killed all the enemy armoured dead). These are the 100YW battles where English archery was considered the most effective. Flodden: basically ineffective. At Flodden, archery wasn't very effective even at short range.
Massed charges against English longbowmen in prepared positions were ineffective. Massed charges against English longbowmen caught without prepared positions were very effective. It doesn't seem to be archery alone that protected them. I think your assumption that an archer can shoot 24-36 arrows at charging cavalry before they arrive is big overestimate. 300 yards is also an overestimate. For range of 240 yards, cavalry closing at 10 yards/second, that's 24 seconds, and 4 arrows. From historical performance in battle, where fewer than 5% of arrows kill or wound, that's less than a 20% chance of wounding or killing anybody. As a longbowman in that situation, you really want that prepared position - stakes and men-at-arms to protect you. If you could stop charges by archery alone, why would it be needed? In practice, it was needed.
Archers were clearly effective enough for commanders to want them in battle. But they weren't supermen, and they weren't capable of going through good armour as if it was butter. The battles mentioned above, and Chinese battles, and Korean battles, and Japanese battles all support the ability of armour to resist arrows. Modern testing of penetration by arrows supports this too. It takes about 70J of energy to pierce 1mm or iron, and about 200J to pierce 2mm (see Williams, The Knight and the Blast Furnace). Considering that breastplates tended to be 2-3mm, and an archer at point blank range might expect to deliver about 150J, or for very, very high draw weights, 200J, how effective can they expect to be? Even mail will require over 100J to defeat. Easy to see why the soldiers wearing such armour often didn't bother with
shields. See stuff on penetration at
http://en.wikipedia.org/wiki/English_longbow#...enetration ; the caveats in the last 2 paragraphs of that section matter! Even if archers can't defeat the best armour, they aren't useless. Which, in turn, means that you cannot conclude that archers could defeat the best armour just because they were considered useful on the battlefield.
As for long draw lengths, look at the actual ranges achieved by very long draw length military archers (Manchu and Japanese, with the normal draw being to beside the rear shoulder, which can mean draw lengths of over 36"). Look at what Korean archers (also usually using long draw lengths, perhaps about 32-34") used to achieve longer ranges - short arrows and arrow guides (similar to Turkish practice, but even shorter and lighter arrows). Draw further, and not only does the arrow need to be longer, it needs to be thicker too, to maintain proper stiffness, and loses more energy to drag. You can expect some improvement in range, but the increase in range will be much lower than the increase in energy.
Archers were certainly valuable in battle, but it wasn't because they could shoot through armour at will, and mow down men-at-arms. Plenty of unarmoured, or less armoured enemy on the typical battlefield. Horses are nice large and often unarmoured targets. And you can hope to pierce armour at short range.