Washington's experience had peculiarly fitted him to catch this vision. Fortune had turned him westward as he left his mother's knee. First as a surveyor for Lord Fairfax in the Shenandoah Valley and later, under Braddock and Forbes, in the armies fighting for the Ohio against the French he had come to know the interior as it was known by no other man of his standing. His own landed property lay largely along the upper Potomac and in and beyond the Alleghanies. Washington's interest in this property was very real. Those who attempt to explain his early concern with the West as purely altruistic must misread his numerous letters and diaries. Nothing in his unofficial character shows more plainly than his business enterprise and acumen. On one occasion he wrote to his agent, Crawford, concerning a proposed land speculation: "I recommend that you keep this whole matter a secret or trust it only to those in whom you can confide. If the scheme I am now proposing to you were known, it might give alarm to others, and by putting them on a plan of the same nature, before we could lay a proper foundation for success ourselves, set the different interests clashing and in the end overturn the whole." Nor can it be denied that Washington's attitude to the commercial development of the West was characterized in his early days by a narrow colonial partisanship. He was a stout Virginian; and all stout Virginians of that day refused to admit the pretensions of other colonies to the land beyond the mountains. But from no man could the shackles of self-interest and provincial rivalry drop more quickly than they dropped from Washington when he found his country free after the close of the Revolutionary War. He then began to consider how that country might grow and prosper. And he began to preach the new doctrine of expansion and unity. This new doctrine first appears in a letter which he wrote to the Marquis de Chastellux in 1783, after a tour from his camp at Newburg into central New York, where he had explored the headwaters of the Mohawk and the Susquehanna: "I could not help taking a more extensive view of the vast inland navigation of these United States [the letter runs] and could not but be struck by the immense extent and importance of it, and of the goodness of that Providence which has dealt its favors to us with so profuse a hand. Would to God we may have wisdom enough to improve them. I shall not rest contented till I have explored the Western country, and traversed those lines, or great part of them, which have given bounds to a new empire."