Lord Palmerston said if you can not defeat an enemy by surprise or the use of force (i.e. gunboat diplomacy), and in doing so may damage an alliance one is trying to win back, then one should turn an enemy into an ally.
Civis Romanus Sum, is Latin for "I am a Roman Citizen".
Feinting is the act of distracting the attacker so that they do not enter the fray at a point that could be catastrophic.