Sarah knows it's a war. Some quotes that apply:
A leader leads by example not by force.
Opportunities multiply as they are seized.
Pretend inferiority and encourage his arrogance.
Speed is the essence of war. Take advantage of the enemy's unpreparedness; travel by unexpected routes and strike him where he has taken no precautions.
A military operation involves deception. Even though you are competent, appear to be incompetent. Though effective, appear to be ineffective.
The general who advances without coveting fame and retreats without fearing disgrace, whose only thought is to protect his country and do good service for his sovereign, is the jewel of the kingdom.
If your opponent is of choleric temperament, seek to irritate him.