wasn't he a General during that time, surly he could have given some military advice/pressure
He tried, he was one of the few advocates of the actual pre-emptive strike and mobile warfare but the french nation and its leaders at the time were
composed of cowards/idiots so his words fell on deaf ears.
He was a colonel who wasn't exactly held in high regard.
He was outright hated for his (reasonable and politically sound) views by a complacent and cowardly french high command.
CDG spent a good long while in Poland. It's a shame that he didn't do more to help Poland after the war (as one of the victors).
While France in 1939 outright betrayed Poland post war there wasnt much it could do, US treated the french with contempt and they could do as much as US allowed them to, by that time both UK and France became second rate powers in the US/USSR struggle.