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Any good general will tell you that even before you blood green troops you must instill discipline in them.
Now there are generals with a few victories who follow textbooks and require strict adherence to chain of command and rulesets.
Then there are the brilliant generals that ensure each warrior is taught to a high standard, trained for the arduous daily duties, prepared for the unexpected dangers, nourished in mind and body; so that they can act quickly and successfully in the rapid decision making needs of battle.

Disciplined troops put civilians at ease. They are then more likely to supply the troops with food, information, and anything else a hardworking military unit may need.