Although the Duke of Berwick was the nominal Commander-in-Chief, his youth, and the distractions incident to youth, left the more mature and popular Sarsfield the possession of real power, both civil and military. Every fortunate accident had combined to elevate that gallant cavalry officer into the position of national leadership.
He was the son of a member of the Irish Commons, proscribed for his patriotism and religion in 1641, by Anna O'Moore, daughter of the organizer of the Catholic Confederation. He was a Catholic in religion, spoke Gaelic as easily as English, was brave, impulsive; handsome, and generous to a fault, like the men he led. In Tyrconnell's absence every sincere lover of the country came to him with intelligence, and looked to him for direction. Early in November he learned through his patriotic spies the intention of the Williamites to force the passage of the Shannon in the depth of winter. On the last day of December, accordingly, they marched in great force under Kirke and Lanier to Jonesboro', and under Douglas to Jamestown. At both points they found the indefatigable Sarsfield fully prepared for them, and after a fortnight's intense suffering from exposure to the weather, were glad to get back again to their snug quarters at Parsonstown.
Early in February Tyrconnell landed at Limerick with a French fleet, escorted by three vessels of war, and laden with provisions, but bringing few arms and no reinforcements. He had brought over, however, 14,000 golden louis, which were found of the utmost service in re-clothing the army, besides 10,000 more which he had deposited at Brest to purchase oatmeal for subsequent shipment. He also brought promises of military assistance on a scale far beyond anything France had yet afforded. It is almost needless to say he was received at Galway and Limerick with an enthusiasm which silenced, if it did not confute, his political enemies, both in Ireland and France.
During his absence intrigues and factions had been rifer than ever in the Jacobite ranks. Sarsfield had discovered that the English movement on the Shannon in December was partly hastened by foolish or treacherous correspondence among his own associates. Lord Riverston and his brother were removed from the Senate, or Council of Sixteen—four from each province—and Judge Daly, ancestor of the Dunsandle family, was placed under arrest at Galway. The youthful Berwick sometimes complained that he was tutored and overruled by Sarsfield; but though the impetuous soldier may occasionally have forgotten the lessons learned in courts, his activity seems to have been the greatest, his information the best, his advice the most disinterested, and his fortitude the highest of any member of the council. By the time of Tyrconnell's return he had grown to a height of popularity and power, which could not well brook a superior either in the cabinet or the camp.