What is the ruling on dealing with two Muslim parties who are at odds and exchanging blows, and what is the role of a Muslim towards them?

When a Muslim witnesses a conflict between Muslims, he must strive to reconcile them and remove the causes of discord, for the corruption of inter-personal relations is the shaver (destroyer). If the error of one party becomes clear, it is obligatory to restrain him from his injustice, and this is part of supporting him. If a Muslim does what he can to condemn the evil and repel the harm, then there is no blame upon him if the combatants do not cease their fighting.