Launches advances holding soldiers caught (9)
I believe the answer is:
Here is my best explanation:
'launches' is the definition.
'advances holding soldiers caught' is the subsidiary indication.
'advances' becomes 'comes'.
'holding' is an insertion indicator.
'soldiers' becomes 'men' (I've seen this before).
'caught' becomes 'c' (cricket abbreviation).
'comes' going around 'menc' is 'commences'.
(Another definition for commences that I've seen is "Opens".)