The next map I did in 2010 was for the game RUS.
Huge map ! 16000 x 10000 px !

Same process to create it. Photoshop and few 3D elements from Maya.

Click image for larger version. 

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Screenshots from the game here:
AGEod - Revolution Under Siege - Screenshots

I also made all the graphics of the game; buttons, UI, soldiers, icons, menus...