I periodically hear a song on the radio, and they always say it's Iron Maiden, but they never disclose the name. Additionally, my friend has an mp3 of it, but the only ID3 tag that is present says "Iron Maiden"
The opening lyric is "You fire your musket but I'll run you through" or something very similar. It has a fast tempo (even for them) and ends a little abruptly. Also it is badass.
What's it called, and what album is it on if you happen to know that too?