In August 1756 Montcalm took Oswego from the English and destroyed it, and in 1757 he captured Fort William Henry; but in the latter year the elder Pitt assumed control of affairs in England, and his aggressive, clear-sighted policy turned the tide of war in England's favour.
He was undoubtedly a clear-sighted and able mathematician, who handled admirably the severe geometrical method, and who in his Method of Tangents approximated to the course of reasoning by which Newton was afterwards led to the doctrine of ultimate ratios; but his substantial contributions to the science are of no great importance, and his lectures upon elementary principles do not throw much light on the difficulties surrounding the border-land between mathematics and philosophy.
In politics the revulsion from his particuar conclusions did not prevent the more clear-sighted of his opponents from recognizing the force of his supreme demonstration of the practical irresponsibility of the sovereign power, wherever seated, in the state; and, when in a later age the foundations of a positive theory of legislation were laid in England, the school of Bentham - James Mill, Grote, Molesworth - brought again into general notice the writings of the great publicist of the 17th century, who, however he might, by the force of temperament, himself prefer the rule of one, based his whole political system upon a rational regard to the common weal.
In this, as in other things, he was eminently clear-sighted and practical.
He was not constitutionally averse from change; and he was too clear-sighted not to see that, sooner or later, change was inevitable.