Well I do think it's good to do some research into Traditions about the Mahdi so we can have a better perspective on the subject ... I'll post some Hadiths from sources here:
Harun Yahya asked:
In his hadiths the Prophet (saas) told us that the Mahdi will be opposed to terror and violence, and that the anarchic environment and all acts of terror will come to an end in his day.
The hadiths state that in the time of the Mahdi all weapons will fall silent and wars will come to an end:
War will lay down its burden (arms and the like). (Sunan Ibn Majah, 10/334; Imam Sharani)
No Blood Will Be Shed in the Time of the Mahdi
Again according to the hadiths,
the Mahdi will bring justice to the whole world, but not one single drop of blood will be shed. The Mahdi will be opposed to terror and violence. War and conflict will come to an end. Yet the Mahdi will follow a very peaceful path as he does all this. This attribute of the Mahdi is set out as follows in the hadith:
In the same way that bees gather round the queen, so people will gather round the Mahdi. He will fill the world, once filled with oppression, with justice instead. Such will be his justice that the sleeping man will not be awakened and no blood will be shed. The world will return to the Age of Happiness.
(al-Qawl al-Mukhtasar, pp. 29 and 48)