Mr. Anson having informed himself of the strength of the place, resolved to attempt it that very night. We were then about twelve leagues distant from the shore, far enough to prevent our being discovered, yet not so far but that, by making all the sail we could, we might arrive in the bay with our ships in the night. However, the Commodore prudently considered that this would be an improper method of proceeding, as our ships, being such large bodies, might be easily discovered at a distance even in the night, and might thereby alarm the inhabitants and give them an opportunity of removing their valuable effects. He therefore, as the strength of the place did not require our whole force, resolved to attempt it with our boats only, ordering the eighteen-oared barge and our own and the Trial's pinnaces on that service; and having picked out fifty-eight men to man them, well provided with arms and ammunition, he gave the command of the expedition to Lieutenant Brett, and gave him his necessary orders. And the better to prevent the disappointment and confusion which might arise from the darkness of the night and the ignorance of the streets and passages of the place, two of the Spanish pilots were ordered to attend the lieutenant and to conduct him to the most convenient landing-place, and were afterwards to be his guides on shore. And that we might have the greater security for their faithful behaviour on this occasion, the Commodore took care to assure all our prisoners that if the pilots acted properly they should all of them be released and set on shore at this place; but in case of any misconduct or treachery, he threatened them that the pilots should be instantly shot and that he would carry all the rest of the Spaniards who were on board him prisoners to England.