Answer:
Europe's military wasn't strong at all and they continued to struggle all throughout history.
Step-by-step explanation:
If this is the expert your talking about "As [the Vikings] were going to their ships, the English army should have come back into the field to prevent them turning inland again. And that’s when the English army went home. . . . All the council was summoned to the king to determine how to defend the realm. But whatever was decided on did not last even a month. In the end, there was no man prepared to call up his forces. Everyone ran off and did the best he could."
then the answer is The military was not strong enough to protect Europe.