The Catholic-Protestant War was a religious war taking place on the island of Ireland. It was mainly fought between the Catholic Paramilitaries and Protestant Paramilitaries. Nearly 25,000 soldiers died and 12,500 civilians died in one of the bloodiest religious wars in history. It was mainly a guerrilla war though a number of battles did take place.
The trigger for the war was the passing of the Secterian Laws by Governor of Northern Ireland Douglas Kellet. Northern Ireland was the first place in Ireland to become a "special administrative zone" so it could pass many laws without interference from the Oireachtas.