Answer:
The purpose of the mission was to split away New England and end the rebellion.
Step-by-step explanation:
John Burgoyne was a British army officer. In the American Revolutionary War, he designed an invasion scheme and was appointed to carrying it through. Nevertheless his plan, he made his forces to advance slowly, that allowed the Americans to concentrate their forces and faced Burgoyne in two battles.
He finally surrendered his forces in Saratoga and is seen as a great turning point of the war.
I hope this answer helps you.