The frontiersmen on the early American West said that they could often tell a greenhorn by how few knives he carried and by how small his main knife was. Those guys were walking cutlery displays, usually packing on them 2 - 3 knives and often a hatchet or tomahawk.
I can't help but wonder what your source for this is?
Have you ever studied the mountain men of the fur trade era? These are guys that actually lived it full time, not played it on the weekend or for a survival show. About 1/3 of them died in their first 24 months on the frontier.
Always carried: Large knife (good for wilderness chores and served as a fighting weapon/sidearm)
Always carried: Patch knife (smallish knife for cutting rifle patches and smaller cutting chores)
Often carried: Skinning knife (on person or with several others in gear on horse or pack animal - made good trade items also)
Often carried: Hatchet/Tomahawk
The school of thought mandating only one smallish knife for a 'real' woodsman is a relatively recent phenomenon, dating from the genteel woodsman culture starting after the closing of the frontier at the end of the 19th Century.
Especially in the days before revolvers became common and cartridge weapons began to dominate, largish knives (9" blade, plus or minus a couple inches) were very common on the frontier.
It wasn't just in the mountains either. It was noted by chroniclers of the early 19th Century that in the rough and tumble river culture of the pre-Civil War western frontier, wher ethe rivers were the main trade and transportation highways, literally every man had a razor sharp large knife, a 9" blade being about average, and they knew how to use it and frequently did. People cut each other up and killed each other on a regular basis with them, and even today Texas still has anti-Bowie knife laws on the books because of it, though many of these knives often resembled butcher knives than the classic 'Bowie' knife.
This tradition goes back to the seax of the Saxons where carrying a long knife was the sign of a free man. Many, many knives of the early frontier looked a LOT like a modern 9" butcher knife from your kitchen. A common trade knife or skinning knife for everyday utility use was usually about 6" in blade length. The patch knife commonly carried with a man's rifle kit was often a lot smaller, with a 2" to 4" blade.
You can have the Ray Mears types talk till the sun goes down about how all you need is a 3" - 4" knife, and yes, you can get by with one with much extra effort. BUT, when you really need to live out there, a larger blade or a hatchet as your primary blade in addition to the smaller blade often makes life a lot easier. For example, want to make a shelter? I can usually make one several times faster with a good 9" blade than someone else can with even the best 4" blade.
The prejudice against large knives by many 'wilderness' types is kind of interesting since they make many tasks a lot easier. I think it has more to do with modern, pre-conceived notions and looks than anything else. It's odd that a 9" butcher knife is judged just fine for the kitchen, but somehow it just isn't good for the woods where you have many similar cutting tasks. It's almost a near religious orthodoxy with some.
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