At length the Emperor hoisted sail at Brundusium with a fleet and army of forty thousand men; but he kept the sea no more than three days; and his hasty retreat, which was ascribed by his friends to a grievous indisposition, was accused by his enemies as a voluntary and obstinate disobedience. For suspending his vow was Frederick excommunicated by Gregory the Ninth; for presuming, the next year, to accomplish his vow, he was again excommunicated by the same Pope. While he served under the banner of the cross, a crusade was preached against him in Italy; and after his return he was compelled to ask pardon for the injuries which he had suffered. The clergy and military orders of Palestine were previously instructed to renounce his communion and dispute his commands; and in his own kingdom the Emperor was forced to consent that the orders of the camp should be issued in the name of God and of the Christian republic.