I am not quite sure but the fith challenge (crazy) is pretty unbalanced. After 10 turns one major faction is almost completly destroyed, and I have to face an army which is impossible to kill. Maybe it would be a help if fog of war can be lifted for this challnge so you see what enemy is doing.
You can play it without fog, but it's "unofficial" - wins don't go on the high scores or unlock the next level, but it's a great way to learn. See http://wiki.warlight.net/index.php/Single-player_levels#Customizing
You can play it without fog, but it's "unofficial" - wins don't go on the high scores or unlock the next level, but it's a great way to learn. See http://wiki.warlight.net/index.php/Single-player_levels#Customizing