Hen attacking cats

Hello, I am new to the hen thing.  Have my 3 hens, Rick, Ray and Rudy now for just over two months.  When I get home from work I let the hens out into a hen proof section of the garden.  They are also for 4 or 5 hours a day at the week-ends.  My cats have the run of the rest of the garden but would spend time in the hen part just lying around, doing what cats do best and looking kind of annoyed.  Last week-end Rick, my mental hen started chasing the cats and pecking at their bottoms.  Now everytime one of my cats appears Rick takes off after him.  Kit and Kat are 13 and this is their home and they were there first.  I have tried sitting with them beside me and Rick on my knee but as soon as I put him down (can't think of rick as a girl - too much of a bully) he jumps up and tries to peck the cats.  I need them to be friends.  Has anyone got any suggestions.

PS:  I have seen Rick chasing a squirrel too. 

Video Rick chasing the cats and with the money you get from 'You`ve been framed' you can buy some cat body armour.


But seriously,the hens will get bored with it , mine used to chase sparrows but soon gave up.

Rick seems to have a serious psychological problem almost certainly caused by having a totally inappropriate name for a lady.  Call her Rachel, Rowena or Roxanne and all will be well
HF

The top hen will sometimes become a sort of honorary cockerel and protecter of the flock, with the top position comes responsibility.

Like politicians,

not!

I wish our hens would chase off the monster tom cats from next door ggrrrrrr

2 of the hens are Blackrocks and we call them The Men in Black, one Bernie (the bully/bouncer and many other names beginning with b) doesn't bother our cats but she does run at all 3 dogs, and they are really scared of her as they each have had a peck off her.

You find Blackrock's are the boss of any group of chickens, its just there nature and the fact I think they are taller!

But I must admit I do love my Ginger (Blackrock)