While the Fourth Crusade is really the archetypal Crusade in many respects—setting off to capture Jerusalem and conquering Constantinople instead really sums up the whole enterprise—the Second Crusade is the one that really set the tone for what the Crusades were capable of becoming. It started off with reasonable goals, fell apart in the planning stage, failed in its intended mission, and then fizzled out for good in a battle it had no real business fighting. That checks off a lot of Crusader boxes.
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