Rise under the Tories
By 1710, Hill's sister, Lady Masham, had supplanted her cousin in the Queen's affections and now joined Robert Harley to weaken Marlborough and advance her brother. The Queen, prompted by Harley, solicited for Hill the colonelcy of the late Earl of Essex's Regiment of Dragoons. Marlborough refused to promote Hill over officers more experienced and deserving, placing additional strain on his relationship with the Queen. In April, he was forced to accede to the Queen's demand that Hill be promoted brigadier general. In May, Hill also received a pension of £1000 p.a. during the lifetime of the Queen. Marlborough and the Whigs in Parliament attempted to have Lady Masham removed from Court, an unsuccessful move which ultimately precipitated Marlborough's own political demise.
Hill, in the meantime, was returned as a Member of Parliament for Lostwithiel in 1710. He showed little activity in the House of Commons, although, as his one-time patroness, the Duchess of Marlborough sourly noted, he did trouble himself to vote once, when ill, to support Harley's attacks on Marlborough.She bitterly continued " this once ragged boy whom I clothed, happening to be sick in bed, was nevertheless persuaded by his sister to get up,wrap himself in warmer clothes than those I had given him, and go to the House to vote against the Duke.
According to Sarah's descendant Winston Churchill, The Duchess was annoyed that her generosity had prepared her own undoing and her husband's fall at the moment when the consummation of all his victories and toils seemed so near. "'One of the traceble causes of her catastrophe."
Moreover, this author, who understood the nature of armies and politics, considered that the promotion of Hill was an insult "of the most carefully studied character" which effectively undermined Marlborough's authority over the British forces. He quotes Sarah again; "The dispute was not between the queen and my lord Duke, as some will have it, but whether Mrs Masham and her party should have a disposal of all the vacancies in the army, and by degrees, of everything else." Thus the tories obtained, through the demise of Marlborough, a fatal blow to the integrity and potency of the alliance against Louis XIV.