The latter only sailed in March 1225, and landed in Thessaly at Halmyros. The Crusader army was soon decimated by disease, however: William of Montferrat himself succumbed to it and the remnants of the army left Greece. If it failed in its original objective, the crusade probably saved Bodonitsa and thereby halted Theodore's southern advance into Central Greece, which either way had never been Theodore's main objective.
In March 1225, the latter set sail and landed at Halmyros in Thessaly. Nevertheless, the Crusader army was quickly decimated by disease; William of Montferrat himself succumbed to it, and the remaining soldiers departed Greece. If it failed its primary mission, the crusade might have saved Bodonitsa and thus halted Theodore's southern advance into Central Greece, which would not have been his main objective.