The result of Charlemagne’s conquests on the east side of the Rhine was
that Germany was for the first time all united under one head, and on
that side the Frankish kingdom was extended to the confluence of the
Danube with the Theiss and the Save.
Against the Saracens in Spain Charlemagne made an important expedition.
The capture of Saragossa laid Aragon and Navarre at his feet, and he
united the whole country as far as the Ebro to his own kingdom as a
Spanish province. During his return the rear-guard under Roland,
suffered a defeat in the valley of Roncesvalles, in which the bravest
champions of the Franks were destroyed. This somewhat tarnished the
laurels Charlemagne had won in Spain, but did not undo the substantial
results of the campaign.