The stratagem he used was characteristic, for the governor of the Castle, Phillippot, though a brave and good knight, was in the case of William of Deloraine,-- "Of letter or line knew he never a one;" and by this neglect in his education was he betrayed.
The artful Chaudrier, who appeared to be his intimate friend, invited the governor to dine with him one day, with some of the citizens of the town, and took occasion, before dinner, to say that he had just received news from England which concerned him.

The governor desiring to know them, he replied, "Of course you shall hear; I will fetch the letter, and it shall be read to you." He then went to a coffer and took out an open letter, sealed, indeed, with the great seal of Edward of England, but which, in fact, related to quite other matters; the governor recognised the seal, and was satisfied that it was an official communication; but, as for the writing, "he was ignorance itself" in that.

A clerk, in the plot, was ordered to enlighten him as to its contents, and read that the King desired the mayor to send him an exact account of all the forces in La Rochelle and the castle, by the bearer of that letter, as he desired to know, and hoped soon to visit the town himself.
Thereupon the mayor begged that on the day following a muster should be made, in the grand square, of all these men-at-arms, and he offered to lend money to the governor, being so directed by the King, to pay his troops.

All this was done as was projected, and the muster took place, every man-at-arms leaving the chateau, and only a few servants remaining there.

Meantime the cunning mayor had provided an ambush of four hundred men, who concealed themselves in _old houses uninhabited which were in the square_, and, when all the troops were assembled, these issued out, and intercepting the return, took possession of the castle, and became masters of the citadel.
Resistance was now in vain: the governor was completely tricked, and the artful traitor had gained his end.