At all events, the Great League of the Hodenosaunee found in him a defender and he was more than once an honored guest in the Vale of Onondaga.
On the other hand, his interest in European affairs was always keen and intelligent, especially in those of England and France, with whose sons he had come into contact so much during the great war.

He maintained a lifelong correspondence with his friend, Alfred Grosvenor, who ultimately became a nobleman and who sat for more than forty years in the House of Lords.

Lennox visited him several times in England, both before and after the quarrel between the colonies and the mother country, which, however, did not diminish their friendship a particle.
In truth, during those troubled times Grosvenor, who was noted for the liberality of his sentiments and for an affection for Americans, conceived during his service as a soldier on their continent in the Seven Years' War, often defended them against the criticism of his countrymen, while Lennox, on his side, very boldly told the people that nothing could alter the fact that England was their mother country, and that no one should even wish to alter it.
But his correspondence with his uncle, Raymond Louis de St.Luc, Marquis de Clermont, not so many years older than himself, covered a period of nearly sixty years filled with world-shaking events, and, though it has been printed for private circulation only, it is a perfect mine of fact, comment and illumination.

St.Luc was one of the few French noblemen to foresee the great Revolution in his country, and, while he mourned its excesses, he knew that much of it was justified.

His patriotism and courage were so high and so obvious that neither Danton, Marat nor Robespierre dared to attack him.