No doubt under some circumstances a chicken/rooster can and will fend off a smaller and/or less determined predator, but I wouldn't call it the norm nor would I bet the chicken in most cases...
		
		
	 
 
Here is what one of the founders of the Iowa Blue chicken club has to say about the Iowa Blue's predator fighting ability.
 
 
One thing is for certain. Iowa Blues DON'T like predators. Their disdain for them runs so deep in their blood that they proudly defy predators with an attitude of "I dare you to try" when chickens of other breed run for cover.
 
Time and time again I hear stories from breeders telling of their Iowa Blue encounters with hawks, raccons, opposums, cats, mice, snakes, etc.
 
 
He goes on to tell this story about his Iowa Blues:
 
 
This was about 10 years ago when I had my first Iowa Blues. I had at the time just one Iowa Blue hen and she was broody with a nice group of about 20+/- Iowa Blue chicks. I turned mom and babies out to enjoy the warm weather and sunshine while I worked inside the chicken shed. After a short while, I heard the warning screech that chickens make when they see danger, so I thought I'd poke my head outside to take a look. I could see a large hawk making circles in the sky, and chickens were hiding everywhere; under bushes, under hutches, under grain wagons, etc. Every chicken was in hiding........except for my Iowa Blues, the broody hen, her chicks, and my only Iowa Blue cockbird (who was on the other side of the barn yard).
 
The broody hen looked up at the hawk circling, and puffed out her chest with one eye angled up at the sky. She'd go back to gathering her chicks, then look up at the hawk and puff herself out. This went on for a few seconds then all at once the hawk dove down upon the hen. When she saw him coming, she jumped up to meet him locking her feet with his talons! There they fought, feet interlocked, wings flapping, beaks jabbing, dust billowing, screeching in ways I'd never heard before, and feathers EVERYWHERE.
 
When the cockbird saw the hawk dive down, he came running to the aid of his damsel in distress. But by the time he got to the sceen of the crime, the hawk had decided he'd met his match and took off in a dead heat to anywhere but where he had just been! The broody hen fluffed herself the way broody hens do, and called out to her chicks. Now, while the fight was going on the chicks all bolted for cover, and now that she was calling them out, they were coming from all over the place! Now, I didn't really notice they had left until the hen called them out, and I still don't know where they came from or where they were hiding.......they just appeared!
 
Once her chicks were gathered safely by her side, she promptly returned to her regular duties of scratching the ground and tending to her chicks, like the whole hawk fight had never taken place. If I had not seen it with my own eyes, there would have been no indication on the hen that such an event ever happened at all! At that moment, the Iowa Blue became my utmost favorite breed of chicken, and they still are today.
 
 
This is just one of the many true stories about the Iowa Blue's ability to fend of predators.