The popular image of the Great Plains Native America is unarmored, of course, but that image fundamentally formed in the late 19th century, when – after centuries of the development of gunpowder weapons – everyone was unarmored. A longer view shows that Plains Native Americans were perfectly capable of both developing or adopting defensive measures which worked. And to get a full sense of that, we need to outline the major phases of the changing warfare on the Great Plains.

F.R. Secoy (op. cit.) essentially breaks warfare into four phases, which happen at different times in different places, based on if they have horses, guns, both or neither. Because horses entered the Great Plains from the South (via the Spanish) but firearms entered the region from the North (via the British and the French, the Spanish having prohibited gun-sales to Native Americans) and spread out from there, for a brief time many of these systems were active on the Plains at once, as both guns and horses diffused through the region.

In the pre-horse, pre-gun phase (described by McGinnis as well, op. cit., 8-9), battles consisted of long-range missile exchanges between warriors who stood behind large shields which protected their whole bodies. Native American warriors in this system also wore armor, heavy leather coats, laminated in multiple layers using thick hide with glue that was sometimes mixed with sand or gravel (one more example of how “leather armor” is almost always hardened leather armor, not modern clothing-leather). Some of this armor may have been effectively quilted leather as well. Clearly, there was plenty of concern about survivability here.

Both guns and horses were apt to disrupt this system. Horses allowed attackers to rapidly close the distance between the two opposing lines of shield-protected foot-missile-warriors, causing the shield-lines to drop away (though smaller shields, used on horseback to ward off arrows and blows were still used) and for both sides to seek instead the mobility of mounted fighting. That was not the end for armor though, because contact with a supply of horses meant contact with the Spanish, and the Apache at least swiftly adopted some of the Spanish methods of making leather “buff coats” into their own armor tradition and copied the shape and pattern of the buff coat itself (while often still making the material using their own tradition). As Secoy notes (op. cit., 18-20), our sources are quite clear that these forms of armor (both original and Spanish-influenced Native armors) were quite effective at resisting the archery fire that dominated both the pre-horse, pre-gun system and the post-horse, pre-gun system.

Meanwhile on the Northern Plains, while the horse had not yet arrived, firearms had, and these had different effects. Firearms spelled the end of the armor once they became common enough, since there was no protection which could resist bullets; some shield use survived, since arrows remained fairly common as well. But this didn’t lead to suicidal warfare. Instead – as had happened on the East Coast as well, Native Americans adapted their warfare to the increased lethality of firearms (on this, note Lee, op. cit. above) by mostly avoiding pitched battles as they became too lethal (which, by the by, the relatively low lethality of pitched battles pre-gunpowder is often taken to mean that Native North American warfare in general was low-lethality; this is wrong. As with most forms of non-state warfare, most of the killing happened in surprise raids and ambushes, which could be extremely lethal and were still quite common).

Once the horse and the firearm were both in wide use in an area, warfare shifted again. War parties became smaller, faster moving and more reliant on surprise (essentially an extension of the raiding-focus of the pre-horse, post-gun system to the high mobility horses supplied). Infantry battle dropped away entirely because it was too lethal and resulted in casualties that low-population density nomads could not sustain (the contrast with the much higher population-density agrarian United States, which was self-immolating in massively costly massed-infantry engagements during the American Civil War, 1861-1865, at exactly this time is striking). These are fairly big, noticeable changes in warfare patterns!

In short, the tactics used in all four of these systems were conditions by casualty aversion, which makes a lot of sense in the context of a low-population density society which simply cannot afford massive losses.

Bret Devereaux, “Collections: That Dothraki Horde, Part IV: Screamers and Howlers”, A Collection of Unmitigated Pedantry, 2021-01-08.