Bonding rabbits

Hi

I have a holland lop, she is 2 1/2. I also have a mini lop she is 1 1/2. I'm am trying to bond these two.

I have a particularly tough situation though. They have fought before, twice.

On accident one escaped from it's cage while the other was out. And another time one was locked (so we thought) in another room and the door was pushed open but the other one was in that room and they fought.

It got bad and they both had scares on they're ears and hair everywhere. I would really like to bond them but they have this bad history. I don't know how to go about doing this? Can someone please help me!