A whole army may be robbed of its spirit; a commander-in-chief may be robbed of his presence of mind.
The ‘spirit’ of the army is its dynamic motivation and energy to engage in warfare.
When an army starts out, its spirit is high. When it has achieved great victory, its spirit is high. In between, it takes work to keep up their spirit.
Spirit can be greatly affected by leadership. If the commanders are positive and energized, they can give rousing speeches that raise the spirit of the whole army. When their spirit is low, they may make bad decisions.
Therefore it is important to sustain the spirit of the army and especially its offices.
The same is true in business. Spirited leaders can make a huge difference to their workforce.