Modern Mattock

I'm curious as to how the Mattock was used in pioneer days.  According to Wikipedia:

• The head of a pick mattock combines a pick and an adze. It is "one of the best tools for grubbing in hard soils and rocky terrain".^[2] The adze may be sharpened, but the pick rarely is; it is generally squared rather than beveled.^[2]

• The head of a cutter mattock combines an axe with an adze. Thus, it has two flat blades, facing away from each other, and one rotated 90° relative to the other. The blade is designed to be used for cutting through roots.^[2]