A History of The Plantagenets, Vol II, The Magnificent Century, Thomas B Costain, 1951, Doubleday & Co
p245: "The hated King's Men had not been under personal attack during the proceedings at Oxford. They had served on the committee of twenty-four and they would not have been distrubed had they not elected to stand out against the Council. Even though Prince Edward came forward boldly in their favor, the four Lusignans were convinced by the bitterness of the storm raised throughout the country that flight was the only course left them. They attempted to get away but, realizing the impossibility of making their escape, took refuge in Aymer's castele at Winchester. Here they were joined by Edward, but this did not stop the baronial party form laying siege promptly to the place. Lacking the supplies for defense, the brothers were compelled to surrender. "They were treated with more consideration than might have been expected under the circumstances. They were told they must leave the country, and a choice was presented to them: the first, exile for all of them; the second, a proposal that Guy and Geoffrey abjure the realm while William and Aymer were to be retained in custody in England. The brothers chose the first course. Dover was then fixed as their port of departure, and it was agreed that they might take the sum of six thousand marks with them. All their properties in England would be confiscated, but a subsistence arrangement would be made for them after their departure..."