Invincible units cheat:
     Note:  Always  make a backup copy before edit a game file. Locate
the  "game.pak"  file  in the "\ubisoft\faces of war\resource" folder.
Open  the "game.pak" file with an archival utility (example: WinZip or
WinRAR)  and  extract  the  files  found  in  it.  You have to extract
"tactis.dl",   "normal.dl",  "hard.dl"  and  "easy.dl"  files  in  the
"set/difficulty" from the "game.pak" file.

     Open the extracted files with a text editor, then find the "ally"
string.  Change  value under the "ally" header in each of the files to
the following:

ally
health_increase 40
health 40 

     Save the files then add the modified files back to their original
locations within the "game.pak" file with the previously used archival
utility.