 Complete the following phrase:  Lignery retreated to Fort Machault, from which he continued to direct harassing raids against the British in 1759. He was organizing an expedition against Fort Pitt the fort built by the British on the site of Fort Duquesne when he received an appeal for help from Pierre Pouchot, the commander at Fort Niagara. Pouchot had sent Lignery some troops, but was himself now 