About this time a fresh trouble arose for Lady Strange, and for her mother and sister-in-law, in the defection of the Duke de la Trémoille from Protestantism. He went to Rochelle; not, however, to take part in the defence of the Huguenots against Richelieu’s attacks, but to join the besiegers. Being received into the Church of Rome by the Cardinal himself, he was at once nominated to the command of the light cavalry. “I cannot get over my astonishment at my brother’s change of religion,” writes Lady Strange to her mother. “There has been a report of it for this long time past; and even the Queen was told that it was quite certain; but she, finding that you Madame, were included in the defection, said she believed nothing at all about it. That led me also to doubt about my brother; but God has thought fit to send this affliction upon you Madame, and upon our house. It distresses me greatly, and even more than I could have believed. The letter from him which you have been pleased to send me shows his thoughts; but I cannot believe in what he says, that ‘a worldly mind would have done differently.’ The Catholics always talk so.” In writing to her sister-in-law, who had just given birth to a little girl, she adds:— “I honour and love you with all my heart; and that makes me doubly disturbed at the change in your husband. It has marvellously astonished me; and I can hardly credit it, but I trust in the goodness of God to change his heart. Certainly, scarcely anyone will believe that it is out of anything but a mere human consideration: and truly, when one regards only that, it does lead one to lose no time in abandoning one’s religious profession. I pity very much the pain you will suffer in not following his example; but nevertheless dear heart, I doubt not that you will resist. God give you strength above your own, and we shall see you doubly serving the advancement of His glory, since you have now no help.—I am told that if my brother could, he would have asked for my fortune: but that the law of the country did not permit it.—I must confess to you Madame, that save from respect to you, I do not know what I should be driven to, by the contempt with which he treats us.” She concludes by imploring her mother’s forgiveness of her second brother, the Count de Laval, who had taken refuge in Holland after some escapades in France.