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Rh. It was undoubtedly his purpose to march south from Philadelphia over the old Monoccasy road to the Potomac and then westward over the Braddock routes which converged upon Fort Cumberland. From there the main track of Braddock's army offered an open way toward Fort Duquesne. As previously suggested it was the advice of Sir John St. Clair, his quartermaster-general, that influenced Forbes to alter his plan and march straight westward from Philadelphia toward Lancaster and the Pennsylvania frontier. Whatever may have induced St. Clair to give this advice, it is sure he had learned some lessons from the disastrous campaign of 1755 when he led Braddock through a country quite devoid of carriages, horses, and produce; Pennsylvania, on the other hand, was the granary of America; and, if a road was lacking, horses and wagons were not, and it was better to lack what could be provided than to lack that which could not possibly be obtained.