Final answer:
The British thought capturing Philadelphia in 1777 would end the Revolutionary War, but despite taking the city, the war continued.
Step-by-step explanation:
The British thought that the capture of Philadelphia, which was the home of the Continental Congress, in September of 1777, would end the Revolutionary War. In this effort, General Howe led fifteen thousand troops and defeated Washington's soldiers at the Battle of Brandywine Creek, ultimately taking control of Philadelphia and forcing the Continental Congress to flee.
Despite occupying Philadelphia during the winter of 1777-1778, the British abandoned the city in June 1778 and refocused their efforts on New York City and the southern colonies, as capturing Philadelphia did not lead to an end to the war.