Expert disruptive innovators, the Irish Republican Army, repeatedly proved this: https://en.wikipedia.org/w/index.php?search=IRA+%22mortar+attack%22&title=Spec

Expert disruptive innovators, the Irish Republican Army, repeatedly proved this: https://en.wikipedia.org/w/index.php?search=IRA+%22mortar+attack%22&title=Special:Search https://en.wikipedia.org/w/index.php?search=IRA+%22mortar+at... Amongst other things, shooting down a helicopter, and having a go, separately, at the queen and the prime minister.