Summing-up of surrender by army corps (14)

I believe the answer is:

recapitulation

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'army corps' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I don't see?

'summing-up of surrender by' is the wordplay.
'summing-up of' becomes 're' (I am not sure about this - if you are sure you should believe this answer much more).
'surrender' becomes 'capitulation' (synonyms).
'by' is a charade indicator (letters next to each other).
're'+'capitulation'='RECAPITULATION'

Can you help me to learn more?

(Another definition for recapitulation that I've seen is " summary".)

I've seen this clue in The Times.

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