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How did Boleslav I of Bohemia become subject to Otto I in 950?

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Stone sculptures of Otto I and his wife Edith, both crowned and seated, displayed side by side in the cathedral at Magdeburg, Germany. — Otto I Otto I and his wife Edith, sculptures in the cathedral at Magdeburg, Germany.

In 950, the Bohemian prince Boleslav I was forced to submit to Otto I following a successful military campaign led by the German king. After an earlier, failed attempt to conquer Bohemia, Otto I launched this campaign to strengthen his frontiers and assert his authority.12

As a result of his defeat, Boleslav I was compelled to recognize Otto I as his suzerain and agree to pay tribute. Despite this formal feudal submission, Bohemia was able to retain its autonomy, and Boleslav I later cooperated with Otto I against the Magyars at the Battle of Lechfeld in 955.12