In the perilous emergency to which he was reduced, Oglethorpe took, for the King's service, the merchant ship of twenty guns, called the _Success_,--a name of auspicious omen,--commanded by Captain Thompson, and manned it from the small vessels which were of no force. He also called in the Highland company from Darien, commanded by Captain McIntosh; the company of rangers; and Captain Carr's company of marines. On the 28th of June the Spanish fleet appeared off the bar below St. Simons; but from their precaution for taking the soundings and ascertaining the channel, was delayed coming in, or landing any of the troops, for several days; in which time "the General raised another troop of rangers; and, by rewarding those who did extraordinary duty, and offering advancement to such as should signalize themselves on this occasion, he kept up the spirits of the people, and increased the number of enlistments."[1] He was placed, indeed, in a most critical situation; but he bore himself with great presence of mind, and summoned to the emergency a resolution which difficulties could not shake, and brought into exercise energies which gathered vigor from hindrance, and rendered him insensible to fatigue, and unappalled by danger. This self-collected and firm state of mind, made apparent in his deportment and measures, produced a corresponding intrepidity in all around him; inspired them with confidence in their leader; and roused the determined purpose with united efforts to repel their invaders. [Footnote 1: The passages distinguished by inverted commas, without direct marginal reference, are from the official account.] At this critical juncture, his own services were multiplied and arduous; for Lieutenant Colonel Cook, who was Engineer, having gone to Charlestown, on his way to London,[1] the General was obliged to execute that office himself, sometimes on ship-board, and sometimes at the batteries. He therefore found himself under the necessity of assigning the command to some one on station, during his occasional absences; and accordingly appointed Major Alexander Heron; raising him to the rank of Lieutenant Colonel. [Footnote 1: We shall see, in the sequel, that the absence of this officer, whatever its pretence, was with treacherous purpose, as may be surmised by the following extract from a letter to the Duke of Newcastle, dated 30th of July, 1741; where, mentioning the despatches sent to Governor Glen, earnestly requesting some military aid, the General informs his Grace that "Lieutenant Colonel Cook, who was engineer, and was then at Charlestown, hastened away to England; and his son-in-law, Ensign Erye, sub-engineer, was also in Charlestown, and did not arrive here till the action was over; so, for want of help, I was obliged to do the duty of an engineer."]