Wearing down of enemy forces (9)

I believe the answer is:

attrition

(Other definitions for attrition that I've seen before include "Constant wearing down - it ain't rot (anag)" , "Wearing down of resistance" , "gradual loss of souls?" , "Wearing down - natural wastage" , "Sinner's inadequate sorrow" .)

I've seen this clue in the Sydney Morning Herald.

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