On All Saint's Day morning, 1755, when the whole populace, from beggar to priest, courtier to lackey, was making its way to church, the town of Lisbon was shaken to its foundations by an earthquake. The shock came about ten o'clock, just as the Misericordia of the mass was being sung in the crowded churches; and Frankland, who was riding with a lady on his way to the religious ceremony, was immersed with his companion in the ruins of some falling houses. The horses attached to their carriage were instantly killed, and the lady, in her terror and pain, bit through the sleeve of her escort's red broadcloth coat, tearing the flesh with her teeth. Frankland had some awful moments for thought as he lay there pinned down by the fallen stones, and tortured by the pain in his arm. Meanwhile Agnes, waiting at home, was prey to most terrible anxiety. As soon as the surging streets would permit a foot passenger, she ran out with all the money she could lay hands on, to search for her dear Sir Harry. By a lucky chance, she came to the very spot where he was lying white with pain, and by her offers of abundant reward and by gold, which she fairly showered on the men near by, she succeeded in extricating him from his fearful plight. Tenderly he was borne to a neighbouring house, and there, as soon as he could stand, a priest was summoned to tie the knot too long ignored. He had vowed, while pinned down by the weight of stone, to amend his life and atone to Agnes, if God in his mercy should see fit to deliver him, and he wasted not a moment in executing his pledge to Heaven. That his spirit had been effectually chastened, one reads between the lines of this entry in his diary, which may still be seen in the rooms of the Massachusetts Historical Society in Boston: "Hope my providential escape will have a lasting good effect upon my mind." In order to make his marriage doubly sure, he had the ceremony performed again by a clergyman of his own church on board the ship which he took at once for England. Then the newly married pair proceeded once more to Frankland's home, and this time there were kisses instead of coldness for them both. Business in Lisbon soon called them back to the Continent, however, and it was from Belem that they sailed in April, 1750, for Boston, where both were warmly welcomed by their former friends.