I am so sorry to hear about your chickens. It might take them a while to settle down after that scary experience and lay eggs. You just have to make sure everything is really secure. I built my run and coop with hardware mesh that was welded - half inch holes only, top, bottom and sides before I attached it to my coop which is wood. I put hasp closures with locks on all the doors because raccoons can even get into a carbiner type of lock put through the loop. I also put a baby monitor in the ceiling of the coop so I can see the temperature and hear the hens if they are disturbed. The baby monitor has a feature that allows me to not hear everything by setting a level, but if they start making lots of noise then I can hear them. I had a friend whose hens were attacked and did not want to repeat that experience. We are in Florida, so I wanted to know what the temperature was in the coop. My husband installed a fan in the window of the coop to have a fan moving the air around and it brought the temperature down about 5 degrees. They won't lay if it is too hot either. I would make sure you have cleaned the coop well after the attack too and put the antibiotic cream on the one with the gash and separate just like the other person suggested.