Wow, awesome. Yep, those are Redwings, and yeah, Passerine birds can be vicious in defending their nests. I saw a Mockingbird attacking a cat in my neighbor's yard once.
I also saw a Starling evading a Cooper's Hawk by staying right above and directly behind it, so that the Hawk couldnt dive-bomb it and hit it with its talons.
i never knew this.. wow