Battle of Lechfeld
In the 10th century, the rule of the Carolingians waned: Magyars destroyed Basel in 917 and St. Gallen in 926, and Saracenes ravaged the Valais after 920 and sacked the monastery of St. Maurice in 939. The Conradines (von Wetterau) started a long time rule over Swabia during this time. Only after the victory of king Otto I over the Magyars in 955 in the Battle of Lechfeld were the Swiss territories reintegrated into the empire.