What were the similarities between the military reforms of Karl Martell and Alfred the Great?

What were the similarities between the military reforms of Karl Martell and Alfred the Great? how can this similarity be explained?

We are talking about Alfred the Great, who ruled in England in the last third of the 9th century. He was the first ruler of the Anglo-Saxon period (until 1066) to call himself the title “King of England”.

Karl Martell ruled in France from 717 to 741 with the title of “majordoma”.

The similarities in their reforms were as follows:

Both strengthened the early feudal state in the face of the enemy threat. Alfred had the Vikings, and Karl had the Arabs.
Both strengthened the army. Karl is a heavy cavalry, and Alfred created a fleet to fight the Vikings. He also divided the country into farms, each of which had to field one soldier. Both formed a military class instead of a militia.

The reason for the similarities: similar domestic and foreign policy objectives in one period of history (early Middle Ages) in one region of Europe.