If you see closely in Generals and Zero Hour Campaign, the first mission always be the easiest level in the scenario. But in this mod, the enemy will show no mercy to you, even in the first level. For example, in the GLA Mission 1, if you choose Hard Difficulty, China army will build 2 fully upgrade Overlord, and the China air attack will do more damage to your base. The USA in GLA Mission 1, if you choose Hard, they will unleashed all of their arsenal, all of them is full with upgrade. Granger in GLA Mission 1, if you choose hard, the Air Attacks will increase your forces casualties. In easy, the attack will easier than Hard or Medium, but the enemy forces will be larger. Also, in the GLA Campaign, you will kill all of the USA Generals (Except Ironside).
No Mercy in all Level
