Why did crusaders go to the northern part of jerusalem to attack the city?

Because the north was the closest part of their path. By attacking from the north they would have been easier to complete their mission.

Explanation:

The "Medieval Crusades" were Western Christian expeditions to end Moslem rule in Jerusalem, which was being destroyed by the Ottoman Turks, Muslims. They began in 1095 and end in 1291, when the Turks resumed the Holy Land.

The term Crusade was not known at the time it occurred. It was so named because its participants considered themselves soldiers of Christ and were distinguished by the cross in their clothes.  At the time they occurred, they were called pilgrimages or holy war by the Europeans. In the Middle East, however, they were called Frankish invasions, because most of the Crusaders came from the Carolingian Empire and called themselves Franks.

The setting of the year 1000 saw the significant growth of the pilgrimages of Christians to Jerusalem, for they believed that the end of the world was near, and so they made sacrifices and sought the sacred lands to avoid eternity in hell.  The world is not over, and Muslims have increasingly occupied the Holy Land, creating great impediments to the transit of Christians. The situation worsened in the course of the eleventh century and angered Christians who gathered for the first military expedition that would take them to the Holy Land to try to expel Muslims from the region and return it to Christians.  Between the years 1096 and 1270, many expeditions were organized to try to reconquer Jerusalem, but Muslims remained firm in the region after several conflicts.

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