Been a while since I used this, but IIRC you create the campaign with the external app (choose your theater, operation, build your army etc.) Then you go into the game, switch on the DCG mod there (in the options menu under "Mods"), and start the "DCG campaign". That will start the actual battle you set up via the external app.
Once you are done there (i.e., if you won, lost, or want to retreat) you save the game under the name of the savefile you created at the very beginning when setting up your campaign. This will trigger the game to minimize, and will make the external app "read" that savefile, and determine the results of the battle for the whole campaign (that leads to an easy exploit by the way...) and will take you to make your next move in the campaign. Once you are done with that, the app will overwrite the campaign save file with the information about the next battle, and you have to go back into the game and load the campaign save file in there.
It sounds a bit more complicated than it really is, it's all just based on that rather hacky way these campaigns are implemented, by changing the information in a save file to change the maps, units etc. in them.
MurcDusen
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