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The Roman legions were formed in the first instance of citizen soldiers, who yet had been made to submit to a rigid discipline, and to feel that in that submission lay their strength.

Goldwin Smith (1881). “Lectures and Essays”, New York : Macmillan
The Roman legions were formed in the first instance of citizen soldiers, who yet had been made to submit to a rigid discipline, and to feel that in that submission lay their strength.