Do you have anyone taking care of them while you're gone?
If so, since you won't be around to know who is attacking whom, I'd pull out the instigators and victims and pen up together who you can separate from the rest. There is no fix for this when you're not around so separation is for their safety.
If nobody is caring for them, then I'd secure a couple of waterers to the pen so they can't tip them over. The same with extra feeders. Be sure there's a box or something for them to sleep at night and get out of the elements.
If you have no such pen, look on Marketplace for a pet pen for your area. There's bound to be a couple.