How did Otto I’s military victories make Germany more secure from foreign attack?

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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.

Otto I secured Germany against foreign threats primarily through decisive military victories that neutralized persistent invaders and expanded the kingdom's frontiers.

His most significant achievement in this regard was the crushing defeat of the Magyars at the Battle of the Lechfeld in 955. This victory was so absolute that the Magyars never invaded Germany again.1

Additionally, Otto strengthened Germany's borders through:
* Slavic Campaigns: Otto and his margraves, such as Gero, conducted a series of successful campaigns against the Slavs between the Elbe and Oder rivers, leading to their subjection by 960.1
* Frontier Expansion: He extended the kingdom's reach by forcing the Bohemian prince Boleslav I to pay tribute and establishing bishoprics in the north to extend Christian influence into Denmark.1
* Consolidation: By suppressing internal rebellions and utilizing the church as a stabilizing framework, Otto created a unified and secure Reich that maintained a position of hegemony in Europe.1