The Fenian invasions after the US civil war with American troops is an obvious one. Your own Guns Across the River book (Best title you have had done btw) and there Alamo of the North.
There where the numerous attempts in south and centeral America as well of course during that period.
Although I think the attitude comes from the Puritan ethos back from the 1600's That they are Gods Elect. Jesus himself gave this land and they and only they alone have the right to do what they like its merely evolved. (A view that Mordern British MP's have off themselves it must be said.)to a firm belief in the 3 G's and Add on a rabid anti British hatred (exists to this day!) and presto there you have it. Thats why Kevin geuniely belives what he is typing and I am sure his brows a furrowed in anger and puzzlement at the replys.
Hence when you use the Hordes of Morder anology and the alliance of the Corsican orge and the American Goblin it would be a Goblin who prays
And it should be noted as well that if we are going about the size of armies Britians was not that big but its what they did with it that counted.