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In page Northern Crusades:
"The Teutonic Order's attempts to conquer Orthodox Russian lands (particularly the Republics of Pskov and Novgorod), an enterprise endorsed by Pope Gregory IX,[12] were a component of the Northern Crusades. One of the major setbacks for the eastward expansion into Russian principalities was the Battle of the Ice in 1242, where forces of Novgorod defeated the Livonian branch of the Teutonic Order. Separately, with or without explicit papal blessing for every campaign, Sweden also undertook several crusades against Orthodox Novgorod.[citation needed]
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