This is a description from how the Challege mode will run:
-At a first place a small galactic conquest will be loaded with a small description about how the game mode runs.
-You will start with a single planet but you can increase your population at 100 points if you build a special station.
-By a high price, it increase the population.
-If you are thinking it, the IA has been disabled and it will not attack your planets. You can make your attack fleet slowly without problems. All the other planets are locked. If you want unlock them, you must send a probe for explore them. It will unlock the planet for your attack fleet.
-The planet is unlock and ready for the attack.
-A very special and customized battle will be loaded but the main difference is how both sides have station and some new units can be builded for the battle. Obviously the IA is reactivate only for the battles and many of its units are selected for each battle.
-The new units will be spawn near your station.
-Other features are these.
You start the Challenge with a default credits and heroes but when you conquer the other planets, you can increase them.
As on skirmiss battles, the enemy will attack you with waves of units.
All the scenary will be very customized and different to other battles from the same planets.
There will be ground battles and you will see the same features from the space battles.
At the end, the main Challenge is defeat your enemy. Perhaps you remember the C&C Generals Zero Hour game where you can find a game mode with this name, the idea is very similar but adapted to Star Wars Empire at War Forces of Corruption game. Have fun.