When you have a vast swathe of troops, it is important that each knows where they should be and what they should do. Strict hierarchical organization is a powerful way of achieving this.
An army travels far, and roads are important both for rapid movement and steady supplies. Wars are won by far more than fighting.
In business, sloppy organization is often mistaken as a way of motivating people. Clear roles and goals works wherever you are.
Armies and businesses spend money and both can run out if it is not managed carefully. Whatever your raison d’etre, cash is still key.