During the American Revolutionary War, the colonial troops attacked the British in Quebec. This was authorized by Congress because the US was relatively desperate. They hoped that, by attacking Quebec, they would be able to get the support of the French Canadians.
The attack was made up of two prongs. One was led by Richard Montgomery and came up on Lake Champlain. The other was led by Benedict Arnold and went overland through what is now Maine.
The two forces besieged Quebec for a few months and then tried a frontal attack that was defeated.