Hens keep attacking my new rooster!

[EastinChickens]

Hello-
Today I went to a poultry auction and bought a nice Blue Orpington rooster.
When I came home, I put him in a cage and let the hens I already have look at him through the wire.
They seemed to be fine, and, in fact, didn't even mind him, so I decided to see what would happen if I put him in the coop with them.
When I put him in, all seven of the hens ganged up on him and made him bleed.
They would do the thing where they jumped into the air and claw at eachother's bellies... and eventually pecked at his comb & wattle so visciously it almost came off!

Is this normal? Can I ever re-introduce them again?
The strang part is... He didnt do anything to them... they just decided to try and kill him!

Any help? Suggestions?

By the way- All seven hens are either red-sex-links or RIRs

 

[TurkeyMountainChickens]

I'd put him BACK in the cage. And then leave them for a few days to get used to him - maybe a week or so. It will give him a chance to heal up, too. You can feed the hens treats right in front of the cage, too.

Then, when you do let him out, try to either do it at night, or with a large dose of treats.