Crossword Genius

Military movements on the borders? (7)

Ross

I believe the answer is:

marches

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'borders?' is the definition.
(I know this)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for marches that I've seen before include "Protest demonstrations" , "Demonstrates" , "Border country - proceeds!" .)

I've seen this clue in The Globe and Mail and The Guardian.
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