That being said, what Madison intended to say was that if it came down to both tyranny and oppression coming to our shores, it would be through the appearance of a fight that involved a country outside of our soil. A present day example of this would be the current war on terror being fought by the US Government in Iraq.
From the text American Government: Brief Version written by James Wilson, two particular quotes are given by Madison himself that, each in their own way, pertain to this very topic. They are, "In framing a government which is to be administered by men over men, the great difficulty lies in this: You must first enable the government to control the governed: and in the next place oblige it to control itself," As well as, "But what is government itself but the greatest of all reflections on human nature If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary," (Wilson p.15).