 However, as the expedition pushed west and Forbes learned that the last ridge to cross would prove particularly difficult, he granted that Washington and other advocates of the Virginia route may have been correct in their assessment of the chosen route's problems.In early September, troops under Henry Bouquet's command began construction of a fort near present-day Loyalhanna Township that eventually came to be known as Fort Ligonier.Bouquet was handling the forward activities of the expedition because Forbes was sick with dysentery.