Hawk Drama

We have hawks nesting in the glen we think and thus have daily sightings of these large birds. Today the hawk swooped through the backyard and landed on the fence of the vegetable garden. From there it went to the bluebird house. I can't be sure but I thought it was after one of the birds. It left then a few minutes ago when I looked out again it was back on the bluebird house.The bluebirds