No, communication was very easy. Like for instance the Iroquois terrorized everyone from New York to Illinois in their heyday and turned most of it into a private hunting reserve to sell furs to white people. Rivers and people raised from birth to go around wandering the woods made communication easy. They were also fairly good tactically. Stay quiet, find the best path, blend in, and trick the poor enemy into getting an arrow in the eye socket. Worked very well. They won plenty of battles against whites, and got even more lethal once they bought guns from whites.
Problem was they couldn't make their own guns, totally lacked artillery, and their numbers were quite bad compared to whites. So their solution was usually starting a race war which went quite poorly and got every white who could carry a gun, including women and children, up in arms against them. Meanwhile there'd always be tribes who didn't want a race war against whites so they'd never be united. End result was Indians getting massacred and losing to superior numbers.
Oh yeah, and then whites figured out Indian tactics and usually were better at them like Kit Carson, he was one scary motherfucker.