No doubt Boniface took great advantage of his fidelity to the Empress Placidia. But he was standing between the all-powerful Barbarians and the undermined Empire. He wanted to remain on good terms with both, and then, when the hour came, to go over to the stronger. This double-faced diplomacy caused his downfall. His rival Aëtius accused him of high treason before Placidia. The Court of Ravenna declared him an enemy of the Empire, and an army was sent against him. Boniface did not hesitate; he went into open rebellion against Rome. Augustin was thunderstruck by his desertion. But what way was there to make this violent man listen to reason, who had at least the appearances of right on his side, since there was a chance they had slandered him to the Empress, and who thought it quite natural to take vengeance on his enemies? His recent successes had still more intoxicated him. He had just defeated the two generals who had been sent to reduce him, and he was accordingly master of the situation in Africa. What was he going to do? The worst resolutions were to be feared from this conqueror, all smarting, and hungry for revenge.... Nevertheless, Augustin resolved to write to him. His letter is a masterpiece of tact, of prudence, and also of Christian and episcopal firmness. It would have been dangerous to declare to this triumphant rebel: "You are in the wrong. Your duty is to submit to the Emperor, your master." Boniface was quite capable of answering: "What are you interfering for? Politics are no business of yours. Look after your Church!" This is why Augustin very cleverly speaks to him from beginning to end of his letter simply as a bishop, eager for the salvation of a very dear son in Jesus Christ. And so, by keeping strictly to his office of spiritual director, he gained his end more surely and entirely; and, as a doctor of souls, he ventured to remind Boniface of certain truths which he would never have dared to mention as counsellor. According to Augustin, the disgrace of the Count, and the evils which this event had brought on Africa, came principally from his attachment to worldly benefits. It was the ambition and covetousness of himself and his followers which had done all the harm. Let him free himself from perishable things, let him prevent the thefts and plundering of those under him. Let him, who some time ago wished to live in perfect celibacy, now keep at least to his wife and no other. Finally, let him remember his sworn allegiance. Augustin did not mean to go into the quarrel between Boniface and Placidia, and he gave no opinion as to the grievances of either. He confined himself to saying to the general in rebellion: "If you have received so many benefits from the Roman Empire, do not render evil for good. If, on the other hand, you have received evil, do not render evil for evil."