Fishing, shooting sea-fowl, and exploring the interior on horseback, were Brock’s chief pastimes.  He became a fearless horseman.  Mount Hillaby rose 1,200 feet above the Caribbean Sea.  The very crest of its almost impossible pinnacle Brock is said to have ascended on horseback.  Between Bridgetown, in Barbadoes, and Kingston, Jamaica, he divided his time, and though monotonous, his life in the Windward Islands was not wholly void of adventure.

Shortly after joining his regiment at Bridgetown our hero had his first affair of honour, an opportunity to display his courage under most trying conditions.  A certain captain in the 49th was a confirmed duellist, with a reputation of being a dead shot at short range.  Resting upon his evil record, this braggart had succeeded in terrorizing the garrison, and it was soon Brock’s turn to be selected for insult.  But Isaac could not be bullied or intimidated.  He promptly challenged and was as promptly accepted.

The fateful morning arrived.  In a lonely spot, palm-sheltered, and within sight of the sea breaking upon the coral reefs, principals and seconds met.  There was no question in Brock’s mind as to his duty—­the duello at that time was the recognized court of appeal.  If its purpose as originally designed had at times been infamously abused, it was still the one and only arbiter through which insults had to be purged and from which, for the “officer and gentleman,” there was no escape.

Now Isaac, who was several inches taller and much bulkier than the scoundrel who had insulted him, declined to become a shining mark at the regulation twelve paces.  He demanded from his fire-eating antagonist that the duel proceed on equal terms.  Whipping out his kerchief, cool as a cucumber, his blue eyes steady and resolute, he insisted that they both fire across it.  The fairness of the proposal staggered the bully.  The chances were not sufficiently one-sided.  If this plan was acted upon he might himself be killed.  He refused to comply.  The code of honour and garrison approval sustained Brock in his contention, and the refusal of the professional killer to fight under even chances was registered in the mess-room as the act of a coward, and he left the regiment by compulsion.

In Jamaica the continued strain of inactivity under which our hero fretted told upon him, and he was struck down with fever, his cousin, Henry Brock, lieutenant in the 13th Foot, dying in Kingston of the same pestilence.  At this time Isaac had as servant a soldier named Dobson, one of those faithful souls who, true as steel, once installed in their master’s affection, remain loyal to the end.  To the untiring attentions of this man Brock owed his life.  Deep and mutual respect followed, and the two became inseparable.  Where Brock went, there was Dobson, sharing his fortune and all the hard knocks of his military campaigns, a fellowship ending only with Dobson’s death, shortly before his “beloved master” gave up his life on Queenston Heights.