Yes broody's we die for their chicks.
I always hatch at least one batch a year. There is something about a hen and her chicks that I just love.
I have one mixed breed bantam that simply will not tolerate my lab mix anywhere near her chicks. She goes after my dog with blind abandonment. Normally they pay no attention to each other. My dog has learned when she sees this hen with chicks she stays back.
This same hen, I have seen take on a red tail and coopers hawk. She stands her ground as her chicks hide. Last year a red tail took a dive at the chicks and then landed on the four foot chain link fence. This hen stood there and puffed up and dared this hawk to go after her chicks that were hiding in the wood pile. The hawk decided to come down to take a closer look and momma went after her with no fear. She actually flogged the hawk.
For the record, I only let momma and her chicks out of the coop when I get home at night and I can keep and eye out. These hawks around here have no fear of humans.