fight during the sacred months if you are attacked for a violation of sanctity is just retribution. thus if anyone commits aggression against you attack him just as he has attacked you but remain conscious of god and know that god is with those who are conscious of him.
الشهر الحرام بالشهر الحرام والحرمات قصاص فمن اعتدى عليكم فاعتدوا عليه بمثل ما اعتدى عليكم واتقوا الله واعلموا أن الله مع المتقين