I have a small flock of 5 hens and a cockerel.  The cockerel is a Black Copper Marans and is a gentleman.  He has two BCM hens, and three Crested Cream Legbar hens with him.  The hens are around three years old, maybe four, I can't remember.
One of the Cream Legbar hens has suddenly decided to fight with me when I come in to fill their food, etc.  Exactly like a cockerel would.  Neck feathers out, biting me, launching and kicking at me.  It's the weirdest thing.  
The only thing I can think of is I have new wellies and they're red.  Last night I went in there and she started fighting with me and I just stood up and held my foot out and she gave my wellie a good pasting before ruffling her feathers and walking away, feeling quite pleased with herself.
The cockerel takes no notice, he just lets her fight with me.  Has anyone ever had a hen do this before?