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In trying to categorize a conflict as religious or holy, we might ask: Are they fighting this war primarily for religious reasons? If little or no religious motivation were present, would they still be fighting? The Crusaders provide a good example. Nobody in his right mind, even in the Middle Ages, would leave the comforts of home, pack up all his belongings, and march off for two thousand kilometers, endure incredible hardships, and face the very real threat of death unless he were religiously motivated.
Also no one live in comfortable at his home and other one come suddenly and attack him.
I will try to show the the western and the eastern view toward the crusade movement from 1095 to 1291

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Speech of pope Urban II at Clermont 1095 (Account of Fulcher of Chartres)

From Krey, "The First Crusade: The Accounts of Eyewitnesses and Participants", Princeton: 1921

"Let hatred therefore depart from among you, let your quarrels end, let wars cease, and let all dissensions and controversies slumber. Enter upon the road to the Holy Sepulcher-, wrest that land from the wicked race, and subject it to yourselves. That land which, as the Scripture says, `floweth with milk and honey' was given by God into the power of the children of Israel. Jerusalem is the center of the earth ; the land is fruitful above all others, like another paradise of delights. This spot the Redeemer of mankind has made illustrious by his advent, has beautified by his sojourn, has consecrated by his passion, has redeemed by his death, has glorified by his burial.

"This royal city, however, situated at the center of the earth, is now held captive by the enemies of Christ and is subjected, by those who do not know God, to the worship the heathen. She seeks, therefore, and desires to be liberated and ceases not to implore you to come to her aid. From you especially she asks succor, because as we have already said, God has conferred upon you above all other nations great glory in arms. Accordingly, undertake this journey eagerly for the remission of your sins, with the assurance of the reward of imperishable glory in the kingdon of heaven.."

When Pope Urban had urbanely said thes and very similar things, he so centered in one purpose the desires all who were present that all cried out, " It is the will of God! I It is the. will of God 1 " When the venerable Roman pontiff heard that, with eyes uplifted to heaven, he gave thanks to God and, commanding silence with his hand, said:

"Most beloved brethren, today is manifest in you what the Lord says in the Gospel, `Where two or three are gathered together in my name, there am I in the midst of them'; for unless God had been present in your spirits, all of you would not have uttered the same cry; since, although the cry issued from numerous mouths, yet the origin of the cry as one. Therefore I say to you that God, who implanted is in your breasts, has drawn it forth from you. Let that then be your war cry in combats, because it is given to you by God. When an armed attack is made upon the enemy, this one cry be raised by all the soldiers of God: 'It is the will of God! It is the will of God!' [Deus vult! Deus Vult!]

"And ee neither command nor advise that the old or those incapable of bearing arms, undertake this journey. Nor ought women to set out at all without their husbands, or brother, or legal guardians. For such are more of a hindrance than aid, more of a burden than an advantage. Let the rich aid the needy and according to their wealth let them take with them experienced soldiers. The priests and other clerks, whether secular or regulars are not to go without the consent of their bishop; for this journey would profit them nothing if they went without permission. Also, it is not fitting that laymen should enter upon the pilgrimage without the blessing of their priests.

"Whoever, therefore, shall determine upon this holy pilgrimage, and shall make his vow to God to that effect, and shall offer himself to him for sacrifice, as a living victim, holy and acceptable to God, shall wear the sign of the cross of the Lord on his forehead or on his breast. When, indeed, he shall return from his journey, having fulfilled his vow, let him place the cross on his back between his shoulders. Thus shall ye, indeed, by this twofold action, fulfill the precept of the Lord, as lie commands in the Gospel, 'he that taketh not his cross, and followeth after me, is not worthy of me."'

Arms of the crusaders, swords, bows, etc..

The first crusade

Pope Urban II