Never did monarch listen to exiled prince with more eagerness than Philip of France listened to the heir of Normandy. Fearing and hating William as he did, Philip smiled with delight at the idea of setting the son to pull down the father, and readily promised his utmost aid. After much conversation on the subject, Curthose formed his plan of action, and, under the auspices of the French king, repaired to Gerberoy, a castle on the frontiers of Normandy.
At that period it was the custom that the castle of Gerberoy should be occupied by two viscounts, equal in authority, and that fugitives from all nations should find protection within its walls. The reception of Curthose at this stronghold was all that he could have wished. He was courteously received at the gate by Elie, one of the viscounts, and afterwards cordially welcomed by Elie's colleague.
Ere this, Matilda of Flanders became aware of the pecuniary embarrassments of her son, and, eager to administer relief without informing William, she contrived, by means of a Breton named Samson, to send Curthose sums of money. Hearing of this, the Conqueror forbade her to hold any communication with a son who had forfeited all title to consideration. Matilda, however, had a will of her own. Her maternal anxiety proving, in this case, infinitely stronger than respect for her husband's mandate, she continued secretly to assist Curthose in the midst of his multitudinous difficulties. William, learning that he had been disobeyed, was highly indignant, and addressed his spouse in language somewhat reproachful.
"Behold my wife," said the Conqueror; "she whom I have loved as mine own soul—to whom I have confided the government of my realms, my treasures, and all that in this world I possess of power and greatness—she hath supported mine adversary against me; she hath strengthened and enriched him with the wealth I confided to her keeping; she hath secretly employed her zeal and subtlety in his cause, and done everything she could to encourage him against me."
"My lord," answered Matilda, "be not surprised if I feel a mother's tenderness for my first-born son. By the virtue of the Most High! I protest that if my son Robert were dead, and hidden far from the sight of the living, seven feet deep in the earth, and that the price of my blood would restore him to life, I would cheerfully bid it flow."
"But," said William, "you support my enemy with the very money I have committed to your keeping."
"And how," asked Matilda, "can you suppose that I could enjoy the pomps and luxuries with which I was surrounded when I knew that he was pining in want and misery? Far from my heart be such hardness!"
On hearing this, William grew pale with vexation. In his rage he bethought him of Matilda's messenger, and gave peremptory orders that Samson should be arrested and deprived of his sight. But the Breton, hearing that his eyes were to be put out, made his escape, and sought safety in the cloister. The old chronicler deemed the circumstance one in regard to which he had a right to be jocular, and remarked that Samson turned monk to save at once his body and soul.
Meanwhile, Curthose hoisted his flag and invited mercenaries to repair, without delay, to the castle of Gerberoy. Thither they flocked as eagles to the carnage. From France, from Flanders, and from Normandy they hastened, on foot and on horseback, with sword and with spear. Even men-at-arms who had served in William's court, who had lived under his protection, and who had partaken of the fruits of his successes, willing to worship the rising sun, left Rouen and galloped to Gerberoy. Curthose ere long found himself at the head of a formidable force, and Philip of France rejoiced in the triumph which he anticipated from having set the son against the father.
William was startled at the menacing attitude which Curthose had assumed, but he acted with all the energy of his earlier days. Landing in Normandy, the Conqueror prepared to encounter his refractory heir as he had encountered other foes, and, attended by his son, William Rufus, appeared in hostile array, and at the head of a numerous army, before Archembrage, where Curthose then was.