Walt, I've watched one of my broody hens beat the tar out of a hawk (twice her size) that was after her chicks once. I've watched one of my brave cockerels attack a mongoose that was after the hens. They were not Buckeye chickens, but still, give them some credit, there are heroes out there. They may not always win, but some of them can put up a darn good fight
I don't know how they survived an encounter with a mongoose, but lucky chicken. Most predators attack at night and it is done in a few seconds. I raise Asils and O Shamo's .....some of the toughest chickens around and they don't last when a predator shows up. The Shamo's males are as big as 17 lbs. People on here also say that their chickens have killed foxes. Well the foxes here kill Sebastopol geese that weigh 20 lbs. These are lovely stories, but chickens just don't do well fighting predators as a whole.
Here is an O Shamo female with a rat. this is not a mouse, but a rat and this females is 11lbs. A predator would take her out in seconds.
Walt