Warfare in Tenth-Century Germany, David S. Bachrach.

A look at warfare under Henry I and Otto I, two of the most successful of the medieval Kings of Germany, and argues convincingly that warfare during their reign was both more professional and carried out on a larger scale than many historians are willing to admit. Makes an excellent use of a wide range of sources to paint a picture of a sophisticated kingdom, capable of maintaining large armies, and carrying out operations across much of central and southern Europe, including a series of expeditions across the Alps.
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