How did Boniface take a letter which was, in the circumstances, so courageous? What we know is that he did not alter his plans. It would indeed have been very difficult for him to withdraw and yield; and more than ever since a new army under Sigisvultus had been sent against him in all haste. A real fatality compelled him to remain in revolt against Rome. Did he believe he was ruined, as has been stated, or else, through his family connections—let us remember that his wife was a Barbarian—had he been for a long time plotting with Genseric to divide Africa? He has been accused of that. What comes out is, that as soon as he heard of the arrival of Sigisvultus and the new expeditionary force, he called in the Vandals to his aid. This was the great invasion of 429.
Ere long, the Barbarians entered Numidia. The borderlands about Hippo were threatened. Stricken with terror, the inhabitants in a mass fled before the enemy, leaving the towns empty. Those who were caught in them rushed into the churches, imploring the bishops and priests to help them. Or else, giving up all hope of life, they cried out to be baptized, confessed, did penance in public. The Vandals, as we have seen, aimed specially at the clergy; they believed that the Catholic priests were the soul of the resistance. Should not these priests, then, in the very interest of the Church, save themselves for quieter times, and escape the persecution by flight? Many sheltered themselves behind the words of Christ: "When they persecute you in this city, flee ye into another."
But Augustin strongly condemned the cowardliness of the deserters. In a letter addressed to his fellow-bishop, Honoratus, and intended to be read by all the clergy in Africa, he declares that bishops and priests should not abandon their churches and dioceses, but stay at their post till the end—till death and till martyrdom—to fulfil the duties of their ministry. If the faithful were able to withdraw into a safe place, their pastors might accompany them; if not, they should die in the midst of them. Thus they would have at least the consolation of lending aid to the dying in their last moments, and especially of preventing the apostasies which readily took place under the shock of the terror. For Augustin, who foresaw the future, the essential thing was that later, when the Vandal wave had swept away, Catholicism might flourish again in Africa. To this end, the Catholics must be made to remain in the country, and the greatest possible number be strengthened in their faith. Otherwise, the work of three centuries would have to be done all over again.
We must admire this courage and clear-mindedness in an old man of seventy-five, who was being continually harassed by the complaints and lamentations of a crowd of demoralized fugitives. The position became more and more critical. The siege lines were drawing closer. But in the midst of all this dread, Augustin was given a gleam of hope: Boniface made his peace with the Empire. Henceforward, his army, turning against the Barbarians, might protect Hippo and perhaps save Africa.
Had Augustin a hand in this reconciliation? There is not the least doubt that he desired it most earnestly. In a letter to Count Darius, the special envoy sent from Ravenna to treat with the rebel general, he warmly congratulates the Imperial plenipotentiary on his mission of peace. "You are sent," he said to him, "to stop the shedding of blood. Therefore rejoice, illustrious and very dear son in Jesus Christ, rejoice in this great and real blessing, and rejoice upon it in the Lord, Who has made you what you are, and entrusted to you a task so beautiful and important. May God seal the good work He has done for us through you!" … And Darius answered: "May you be spared to pray such prayers for the Empire and the Roman State a long time yet, my Father."
But the Empire was lost in Africa. If the reconciliation of the rebellious Count had given some illusions to Augustin, they did not last long. Boniface, having failed in his endeavours to negotiate the retreat of the Vandals, was defeated by Genseric, and obliged to fall back into Hippo with an army of mercenary Goths. Thus it came about that Barbarians held against other Barbarians one of the last Roman citadels in Africa. From the end of May, 430, Hippo was blockaded on the land side and on the side of the sea.
In great tribulation, Augustin resigned himself to this supreme humiliation, and to all the horrors which would have to be endured if the city were captured. As a Christian, he left all to the will of God, and he would repeat to those about him the words of the Psalm: "Righteous art Thou, O Lord, and upright are Thy judgments." A number of fugitive priests, and among them Possidius, Bishop of Guelma, had taken refuge in the episcopal residence. One day, when he lost heart, Augustin, who was at table with them, said:
"In front of all these disasters, I ask God to deliver this city from the siege, or, if that be not His decree, to give His servants the necessary strength to do His will, or at least to take me from this world and receive me into His bosom."
But it is more than probable that discouragement of that kind was only momentary with him, and that in his sermons, as well as in his conversations with Boniface, he did his utmost to stimulate the courage of the people and the general. His correspondence includes a series of letters written about this time to the Count of Africa, which manifest here and there a very warlike spirit. These letters are most certainly apocryphal. Yet they do reveal something of what must have been the sentiments just then of the people of Hippo and of Augustin himself. One of these letters emphatically congratulates Boniface upon an advantage gained over the Barbarians.
"Your Excellency knows, I believe, that I am stretched upon my bed, and that I long for my last day to come. I am overjoyed at your victory. I urge you to save the Roman city. Rule your soldiers like a good Count. Do not trust too much to your own strength. Put your glory in Him Who gives courage, and you will never fear any enemy. Farewell!"