What defense points in a medieval castle help withstand 10 archers and 100 knights?

Merlons, crenels, and parapets.

Explanation:

"The top of the castle walls were the battlements, a protective, tooth shaped parapet often with a wall walk behind it for the soldiers to stand on. The defenders could fire missiles through gaps (crenels). The raised sections between, called merlons, helped to shelter the defenders during an enemy attack."

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