The gdi_retreat.zip file you have requested: Maps Levels Missions / Multiplayer / GDI Retreat - 108.76kb is not available. Perhaps try browsing all files for the game C&C: Tiberian Sun Firestorm and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Command & Conquer, visit Commandandconquer.filefront.com GDI Retreat is created by Tiberian_Master and it's still in the development stages. This is the preview of the final map and created with FinalSun v1.01.