The Crusades was called the worlds most successful failure because it brought culture and technology back from the Middle East and they feudal system and the power of the church declines.
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It was a success because the Europeans were introduced to the knowledge of the ancient past that was being preserved by the Muslims. It was a failure because they never regained the Holy Land. (Which explains why it's called 'history's most successful failure.')
Because they fail successfully.
only the first crusade was successful and out of nine crusades
because the christians got the holy land (jerusalem) and then lost it about 100 yrs later to the muslims
Only in the first crusade.