On March 11, 1755, after nearly 30 years of uncertainty about his titles to Marlborough, Mercer at last was granted the entire 52-acre town in a release from the feoffees, Peter Daniel and Gerard Fowke. This was made with the provision that he should be "Eased from making improvements on the other twenty-six Lots (those not built upon), to prevent their forfeiture and the County will be wholly reimbursed, which it is not probable it ever will be otherwise as only one Lot has been taken up in forty-seven years last past and there is not one House in the said town which has not been built by the said Mercer."[129]
While the day-to-day events of Marlborough went on much as ever, the conflict between the British and the French spread from Canada southward along the western ridge of the Appalachians. This expansion, inevitably, was reflected in the Mercers' activities in many ways, both great and small. As the struggle approached its climax, Braddock's troops came to Virginia in March 1755, and were quartered in Alexandria. Among them was John Mercer's brother, Captain James Mercer, who was a professional soldier. On March 25 John left Marlborough for Alexandria, probably to greet James and to have him billeted at William Waite's house where young son James already was living as Waite's apprentice. This bringing together of two far-flung members of the Mercer family had unanticipated results. Captain James was a British gentlemen-officer, untouched by the leveling influences of colonial life and therefore untempted to banish "false pride" by any such radical means as John had employed with young James. Indeed, the sight of his nephew learning a mechanical trade must have been a rude shock, for we learn from John Mercer that Captain James "found means to make his nephew uneasy under his choice; and I was from that time incessantly teazed, by those who well knew their interest over me, until I was brought to consent very reluctantly that he should quit the plumb and square" and become a lawyer.[130]
Mercer returned to Marlborough by way of George Mason's, near the place where a few months later William Buckland was to begin work on "Gunston Hall." He remained there all day on April 1--"at M^r Mason's wind bound," he wrote in his journal. The next day he went "home through a very great gust."