The Appointee of His Highness Sheikh Nazim Al-Qubrusi, Sheikh Ahmad Yasin explains that Hazrat Mahdi will not shed blood.

Hazrat Mahdi (pbuh) is a man of heart; he will bring serenity. Everyone has already brought so much war. Freemason brings war, atheist brings war. Communist brought bloodshed. Everyone brought trouble and corruption. If Hazrat Mahdi (pbuh) also brought these, what difference would there be in between? Are you insane? He is a man of heart. He is a man of peace. When he comes, nothing would have an effect. There will be no blood bath. He has nothing to do with swords and blades. Pay attention to what I am saying. Some people are saying so; well suit yourself. I am not saying so. Hazrat Mahdi (pbuh) is a man of heart. There will be no blood, no discord, no war, no conflict, nothing would happen. He comes in serenity. The lamb and the wolf will live together. He is such a great friend of Allah that he is above the sheikhs. Do you not see his Excellency Hadji Bektas Veli? There is a lion in one arm and a deer in the other. He [Our Prophet (saas)] says that in the time of Hazrat Mahdi (pbuh) we will live a period when the wolf and the lamb will be together. This could happen with help [of Allah] through the owners of wisdom.

Together with his commanders and soldiers, all of them constitute a group as big as the martyrs of Al-Badr, they are a total of 314 people. The ones called his soldiers are actually the men of heart; they are his students. They are well-mannered, disciplined and decent, quick-witted [who understand things without being said], they have love for the young and respect for the elderly, they treat everyone on earth with compassion and mercy. They are the ones who would not even pluck a green herb thinking that it cites Allah. They would not tyrannize over anything on the face of Earth. Such are the soldiers of him, such are the students of him.  The reason why we call them soldiers is because it comes from Arabic, that is the word "nefer" (individual, person), it comes from the student. They are men of heart, they are men of soul. He [Hazrat Mahdi (pbuh)] is the one away from corruptions and mischief. There is no quarrel. There is no grudge in them. There is no pride in them. They embrace everybody. They help every single one of you. When we see those individuals, we would know that they are the soldiers or commander of Hazrat Mahdi (pbuh).  Such people are the ones we always look for in dervish lodges and Islamic monasteries. So we know that they are the soldiers of Allah. Otherwise the others are not. Those are the ones who come to be like them but could not and failed in the school; they are the raw ones. 

I will tell you become the ummah, the student of Hazrat Mahdi (pbuh).