The point about long to learn was that it took the Europeans hundreds of years moving out of ither little 'strip' of land. When I say it took them long it was about the actual combat, not warfare. There they always had the upper hand due to numbers and basically being more ruthless and not to good to actually go back on agreements in a big way. They were used to big scale warfare from hundreds of years of practice in Europe. But actual fighting group vs group here and there, it took time. Yes certain units were created like the Rangers, but they were rather few. Now one could technically argue that there wasn't a need for more since numbers carried such a weight that the light infantry tactics couldn't stop them, only annoy and cause casualties. But eventually they would get there most of the time. And they did as far as I have understood.