<P> Newcastle and Pitt joined in an uneasy coalition in which Pitt dominated the military planning . He embarked on a plan for the 1758 campaign that was largely developed by Loudoun . He had been replaced by Abercrombie as commander in chief after the failures of 1757 . Pitt's plan called for three major offensive actions involving large numbers of regular troops supported by the provincial militias, aimed at capturing the heartlands of New France . Two of the expeditions were successful, with Fort Duquesne and Louisbourg falling to sizable British forces . </P> <P> The Forbes Expedition was a British campaign in September--October 1758, with 6,000 troops led by General John Forbes sent to drive out the French from the contested Ohio Country . The French withdrew from Fort Duquesne and left the British in control of the Ohio River Valley . The great French fortress at Louisbourg in Nova Scotia was captured after a siege . </P> <P> The third invasion was stopped with the improbable French victory in the Battle of Carillon, in which 3,600 Frenchmen defeated Abercrombie's force of 18,000 regulars, militia, and Indian allies outside the fort which the French called Carillon and the British called Ticonderoga . Abercrombie saved something from the disaster when he sent John Bradstreet on an expedition that successfully destroyed Fort Frontenac, including caches of supplies destined for New France's western forts and furs destined for Europe . Abercrombie was recalled and replaced by Jeffery Amherst, victor at Louisbourg . </P> <P> The French had generally poor results in 1758 in most theaters of the war . The new foreign minister was the duc de Choiseul, and he decided to focus on an invasion of Britain to draw British resources away from North America and the European mainland . The invasion failed both militarily and politically, as Pitt again planned significant campaigns against New France and sent funds to Britain's mainland ally of Prussia, while the French Navy failed in the 1759 naval battles at Lagos and Quiberon Bay . In one piece of good fortune, some French supply ships did manage to depart France and elude the British blockade of the French coast . </P>

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