Dickens’ opinions on the matter should not count for much. Patriotic Americans have never appreciated know-it-all foreigners butting into America’s internal affairs. Of course the term “patriotic Americans” does not include the Confederates who would have welcomed any sort of European invasion if it would have allowed them to keep their precious institution of slavery.
No Confederates wished for a European invasion, they fought against an invader. Those desirous of European invasion would have included the past governors of Massachusetts and Connecticut who refused to call up their militia in response to President Madison's and Congress' request for militia.
Gov. Caleb Strong received the following from the War Department,
July 21, 1812.“Patriotic Americans?” I think not.Sir,
By information received from Major General Dearborn, it appears that the detachments from the militia of Massachusetts for the defence of the maritime frontier, required by him under the authority of the President, by virtue of the act of the 10th of April, 1812, have not been marched to the several stations assigned them. [emphasis mine]