Is this a Hawk Sparrow? What's it doing?

So I have a really nice bird feeding station, and since it's spring, I'm starting to see a whole bunch of birds. this afternoon, I was watching the sparrows, chickadees, Juncos, and finches, when a much larger bird swooped down to the station. It didn't try to harm any of the birds, but it scared them all away. It didn't really eat the seed, it just kind of walked around, flying short distances, whenever it got spooked. The bird stood about a foot tall, and seemed to have a pretty large wing span. It's back was a dull blue, and it had a fairly small head with a hawk-like beak. It had brown speckles on its chest, and didn't seem very intimidated or intimidating. It walked around for 15 minutes or so, then flew into a nearby spruce tree where it still sits. My dad suggested that it was a Hawk Sparrow, and I kind of think so to. But if it is, why is it hanging around a bird feeder in the middle of the woods? He looks healthy, but it just seems out of character for that species to be doing that? Any thoughts? Thanks!