This came up recently in my CCN circle, prompting me to do a search and I found this thread. However, it seems that the conclusion given above was ultimately reversed in a
BGG thread
, leading to the
FAQ entry
which states:
Guerilla Marker
If a French player’s command card is canceled with a successful Guerrilla Marker, may the canceled Command card be counter attacked by the Spanish player?The Spanish player may play a Counter Attack Command card and use the canceled Command card.
(Richard Borg; 2015 - July - 16) 
