Some roosters will fight any predator, but probably 99.999% of them will beat the hens to the hen house, if threatened. The vast majority limit their "protection" to sounding an alarm when winged predators threaten. Others may or may not offer themselves as the first line of defence, and therefore get eaten first. Most will come running if a hen is crying in distress, but many stop short of entering the fray. Guess that's why they are called "chickens". That said, I love roosters and have many. I love their majesty, attitude, and even their crows. They do offer some semblance of security in that they are very vigilant. Only add a rooster to your flock if he is mature. Newbie immature roosters are resented by the hens as an intruder and they show their resentment severely. A mature cock will simply take charge and proceed to treat the ladies with respect. Have fun..........Pop