Troops grow united when marching deep into enemy lands. Cut off retreat to stir desperate bravery. Sustain soldiers, hide stratagems, ban doubts and superstitions; trapped troops will fight fearlessly without strict commands.
This passage warns against reckless forced marches: rushing ahead loses supplies, while full baggage slows troops. Longer rapid marches cause severe troop attrition. It stresses armies need supplies, plus knowing allies, terrain and guides for safe movement.