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In page Fourth Crusade:

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Although Innocent III had again demanded that they not attack, the papal letter was suppressed by the clergy, and the crusaders prepared for their own attack, while the Venetians attacked from the sea. Alexios V's army stayed in the city to fight, but when the unpaid Varangians left the city, Alexios V himself fled during the night. An attempt was made to find a further replacement emperor from amongst the Byzantine Greek nobility, but the situation had now become too chaotic for either of the two candidates who came forward to find sufficient support.[citation needed]