The Devil attacked Padre Pio with numerous types of temptations. Padre Augustine also confirmed that the Devil appeared to him under many different forms. "The Devil appeared as young girls that danced naked, as a crucifix, as a young friend of the monks, as the Spiritual Father or as the Provincial Father; as Pope Pius X, a Guardian Angel, as St. Francis and as Our Lady. The Devil has also appeared in his horrible forms with an army of infernal spirits. There were other times when Padre Pio was approached by the Devil but without any apparition. He was troubled with deafening noises and covered with spittle, etc. Padre Pio succeeded in freeing himself from these attacks of the Devil by invoking the name of Jesus.
The struggle between Padre Pio and Satan became more difficult when Padre Pio freed the souls possessed by the Devil. Father Tarcisio of Cervinara said, "More than once, before leaving the body of a possessed, the Devil has shouted, "Padre Pio, you give us more trouble than St. Michael"; also, "Father Pio don't steal the bodies from us and we won't bother you."
Anyone interested in demonic infestation and possession should read Malachi Martin’s “Hostage to the Devil.” The five cases detailed there are convincing and deeply unsettling.