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In page Henry the Fowler:

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In 920, the king of West Francia, Charles the Simple, invaded and marched as far as Pfeddersheim near Worms, but retreated when he learned that Henry was organizing an army.[1] On 7 November 921, Henry and Charles met and concluded the Treaty of Bonn, in which Henry was recognized as the east Frankish king and Charles rule in Lotharingia was recognized.[2] Henry then saw an opportunity to take Lotharingia when a civil war over royal succession began in West Francia after the coronation of King Robert I.[3] In 923 Henry crossed the Rhine twice, capturing a large part of the duchy.[4] The eastern part of Lotharingia was left in Henry's possession until October 924.[citation needed]