after braddock's defeat, the forts in the juniata valley came under attack by several native tribes, as well as french troops. the worst of these attacks came at fort granville on august 3, 1756 when louis coulon de villiers succeeded in taking the outpost, and in the process killed the lieutenant in charge of the fort. fort shirley served as colonel john armstrong's advanced post for the raid on kittanning in the fall of 1756; and although the expedition was viewed as a success, this garrison was abandoned by provincial forces later that september.