Answer:
The Battle of Saratoga.
Step-by-step explanation:
The two Battles of Saratoga were a point decisive in the American Revolution according the Historians of Britain Encyclopedia but others searching match with this point of view.
They took place in the fall of 1777. The first battle of Saratoga was on september and the second was on october.
These battles did help to persuade the French to recognize the independence and to openly provide military assistance.