1066 Pevensey event — no resistance in contested region (2-4-4)

I believe the answer is:

no-mans-land

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'region' is the definition.
(no man's land is a kind of region)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for no-mans-land that I've seen before include "Unoccupied zone" , "Ambiguous region" , "disputed territory" , "Area between two opposing armies" , "Neutral area" .)

I've seen this clue in The Times.

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