 This and similar small groups in the mountains were the basis of the Viet Minh, the armed wing of the Vietnam Independence League.The local Nung hill people spoke little Vietnamese, so Giáp and his colleagues had to learn local dialects and draw pictures to communicate.When Vichy security patrols approached, they would conceal themselves in a cave under a waterfall, or, at times, in the lands of the Man Trang people.