Go through with soldiers sitting on 'final' vehicle (8)
I believe the answer is:
rehearse
'go through' is the definition.
(thesaurus)
'soldiers sitting on final vehicle' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'sitting on' is a charade indicator (letters next to each other).
'final vehicle' becomes 'hearse' (**).
're'+'hearse'='REHEARSE'
'with' is the link.
(Other definitions for rehearse that I've seen before include "Practise like actor" , "What actor does to prepare for play" , "Practise before performing in public" , "Run through (a play)" , "prepare for performance" .)