How did geography contribute to the successful conclusion of the Revolution at Yorktown? British soldiers were unable to mobilize their forces after crossing the Appalachian Mountains. The French navy, positioned off the Atlantic coast, cut off the escape of the British forces at Yorktown. The Americans were outnumbered and resorted to guerrilla warfare, which led to the defeat of the British. By positioning the American artillery on the bluffs above Yorktown, the patriots were able to seize the victory.'