Working for most of the summer on the construction of the road and on periodic fortified supply depots, the expedition did not come within striking distance of Fort Duquesne until September 1758. In mid-September, a reconnaissance force was soundly defeated in the Battle of Fort Duquesne when its leader, Major James Grant, attempted to capture the fort instead of gathering information alone. The French had its supply line from Montreal cut by other British actions and so attacked one of the expedition's forward outposts, Fort Ligonier, in an attempt to drive off the British or to acquire further supplies, but they were repulsed during the Battle of Fort Ligonier.