Confederate raiders came down from Canada in mid-Civil War and shot up the town of St Albans Vermont - which must have been rather a surprise for the locals. Can't have helped relations with Canada much.

And of course we got substantial Fenian Raids in return - with casualties on both sides - mostly ours. But the member who provided the link to the 79th New York Volunteers opened my eyes. Fascinating, surprising reading.

The prejudice against the British way of waging war was a huge problem amongst the Allied generals in WW2 - recent scholarship is very clear. Some American generals acted as if the War of 1812 had just ended. Pick up one of Rick Atkinson's first two books of his still-being-written trilogy. The US has never seen the British Army as a role model and followed the French way of things until they realized they the French had stopped winning wars.