Dudley was for some time under the necessity of living in great privacy at Bristol; but when the king had been executed, and the royalists were finally crushed at Worcester, Dud gradually emerged from his concealment. He was still the sole possessor of the grand secret of smelting iron with pit-coal, and he resolved upon one more commercial adventure, in the hope of yet turning it to good account. He succeeded in inducing Walter Stevens, linendraper, and John Stone, merchant, both of Bristol, to join him as partners in an ironwork, which they proceeded to erect near that city. The buildings were well advanced, and nearly 700L. had been expended, when a quarrel occurred between Dudley and his partners, which ended in the stoppage of the works, and the concern being thrown into Chancery. Dudley alleges that the other partners "cunningly drew him into a bond," and "did unjustly enter staple actions in Bristol of great value against him, because he was of the king's party;" but it would appear as if there had been some twist or infirmity of temper in Dudley himself, which prevented him from working harmoniously with such persons as he became associated with in affairs of business. In the mean time other attempts were made to smelt iron with pit-coal. Dudley says that Cromwell and the then Parliament granted a patent to Captain Buck for the purpose; and that Cromwell himself, Major Wildman, and various others were partners in the patent. They erected furnaces and works in the Forest of Dean;[12] but, though Cromwell and his officers could fight and win battles, they could not smelt and forge iron with pit-coal. They brought one Dagney, an Italian glass-maker, from Bristol, to erect a new furnace for them, provided with sundry pots of glass-house clay; but no success attended their efforts. The partners knowing of Dudley's possession of the grand secret, invited him to visit their works; but all they could draw from him was that they would never succeed in making iron to profit by the methods they were pursuing. They next proceeded to erect other works at Bristol, but still they failed. Major Wildman[13] bought Dudley's sequestrated estate, in the hope of being able to extort his secret of making iron with pit-coal; but all their attempts proving abortive, they at length abandoned the enterprise in despair. In 1656, one Captain Copley obtained from Cromwell a further patent with a similar object; and erected works near Bristol, and also in the Forest of Kingswood. The mechanical engineers employed by Copley failed in making his bellows blow; on which he sent for Dudley, who forthwith "made his bellows to be blown feisibly;" but Copley failed, like his predecessors, in making iron, and at length he too desisted from further experiments.