Crossword Genius

By whom attacks are mounted (7)

Ross

I believe the answer is:

cavalry

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If this is the answer I cannot explain how the clue works.

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(Other definitions for cavalry that I've seen before include "Soldiers on horseback" , "Mounted soldiers" , "Horse-soldiers" , "Mounted troops" , "Military unit" .)

I've seen this clue in The Irish Independent.
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