Till within two days of the murder, Bothwell had not made up his mind how the King was to be killed. He held various secret meetings with his four principal accomplices, at which the plan first proposed was to attack Darnley when walking in the gardens adjoining the Kirk-of-Field, which his returning health enabled him to visit occasionally when the weather was favourable. But the success of this scheme was uncertain, and there was every probability that the assassins would be discovered.[33] It was next suggested that the house might easily be entered at midnight, and the King stabbed in bed. But a servant commonly lay in the same apartment with him, and there were always one or two in the adjoining room, who might have resisted or escaped, and afterwards have been able to identify the criminals. After much deliberation, it at length occurred that gunpowder might be used with effect; and that, if the whole premises were blown up, they were likely to bury in their ruins every thing that could fix the suspicion on the parties concerned. Powder was therefore secretly brought into Edinburgh from the Castle of Dunbar, of which Bothwell had the lordship, and was carried to his own lodgings in the immediate vicinity of Holyrood Palace.[34] It then became necessary to ascertain on what night the house could be blown up, without endangering the safety of the Queen, whom Bothwell had no desire should share the fate of her husband. She frequently slept at the Kirk-of-Field; and it was difficult to ascertain precisely when she would pass the night at Holyrood.[35] In his confession, Hay mentions, that "the purpose should have been put in execution upon the Saturday night; but the matter failed, because all things were not in readiness." It is not in the least unlikely that this delay was owing to Mary's remaining with her husband that evening.