I think it's just that as protectors of the realm we both heard the call to ride out!
And yeah, it's a good song! I'm really sad though that Dio mostly did this kind of heavy stuff, because he had a great voice but I can't really listen to it because the music isn't my style, save for a few exceptions like Neon Knights and a couple of others. Plus his fantasy/medieval themed lyrics are awesome. I have only heard him with Rainbow and Black Sabbath, but I'll definitely check out his other works.