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.