Crossword Genius

Problem with First World War battle command (7)

Ross

I believe the answer is:

summons

I'm a little stuck... Click here to teach me more about this clue!

'command' is the definition.
(I know that summons is a type of order)

'problem with first world war battle' is the wordplay.
'problem' becomes 'sum' (arithmetic problem).
'with' is a charade indicator (letters next to each other).
'first world war battle' becomes 'mons' (I can't justify this - if you can you should give a lot more credence to this answer).
'sum'+'mons'='SUMMONS'

Can you help me to learn more?

(Other definitions for summons that I've seen before include "orders" , "Order to attend court" , "Legal order" , "Order to appear in law court" , "Call to join" .)

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