I find that tanks are very good for sieging and taking enemy teritory but they are not as good at defending the teritory as infantry are. Probably because it is easier to entrench infantry than it is to entrench tanks. Also tanks are more easier to flank than infantry are. Infantry are also invaliable to urban combat. Infantry also are cheaper and easier to field and maintain than tanks are. There is a section in a book called Death Ground: Today's American Infantry in Battle written by Army Colonel Daniel P. Bolger that explains infantry's role with tanks in the armored cav.
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