I'm finally getting the hang of the most complex settings on this wonderful game (army-by-army mode, with all the reaction and interception settings on). It is quite a mental puzzle how to make best use of this initially, but I figured that this mode was the key to unlocking the full tactical and operational simulation potential of the game; it seems it is!
How I finall figured it out was this: (and maybe you guys would consider creating a "Tutorial #4 set on a small front on the Balkans late in teh war or something that would sort of simulate this?) I started up a Grand Campaign, and turned the AI down to lowest diffiiculty but everything else on full complexity.
Playing as CP, I chose Kronprinz Plan, and France chose Plan XXIV or something like that: basically frontal assault across the border. The AI attacked me in Luxembourg in the pre-Turn, so after refilling my damaged units I puzzled over how exactly I might use this Coordination plus army-by-army mode to rollup the French left-flank (Longwy as left).
Looking at all the armies I through VII arrayed along my front from my right-flank (Luxembourg) to my left-flank (Mulhouse) I realized that there are two to three "Reserve" corps in every army (corps without the little Roman Numberal in the upper right of the corps icon). It took me a while to realize that: these "flexible assignment corps" coudl be moved into a region with the activated army, but once I did realize that I was off to the races.
In the pre-turn I reset III Army (the one on Luxembourg at start) as the main army and activated it. Now I could move my heavy hitting "Flexible" corps from I, II, IV, and even as far as V armies along the front. I had to replay it a couple times to figure it out, but eventually managed to use mostly railroad to get the one 7.8.4 "Flex" Corps as well as several 5.6.4 Flex Corps and the GHQ all positioned either IN Luxembourg or on the way there at the end of the Early August pre-turn.
It didn't work exactly how I wanted (some units did not move as far as I expected them to move), but more-or-less I managed to get a large mass of the Flex Corps in position before the start of the August turn. Next turn it was a simple matter to once again activate III Army, send it into Longwy, and also send in as many of those Flex Corps as possible . . . again it didn't work out exactly as planned. The GHQ and only one or two of the Flex Corps got there first . . .but in any event, the French forces in Longwy were (just barely) overwhelmed and retreated! Yah! Now I was off to the races with making use of Breakthrough moves, Interceptions, and the most powerful part of the army-by-army mode: moving the ADDITIONAL armies that did not coordinate in the first moves of that month!
There are still some slightly annoying glitches here, but overall I can now fully appreciate what a brilliant game engine this is! (e.g., get V Army to successfully coordinate, and then move a Flex Corps [lets say XLV Corps] OUT of V Army onto the map in Saarbourg *poof* XLV Corps suddenly loses its V Army assignment making it ineligible to move!? Hey! It shouldn't work THAT WAY!).
My question(s) are as follows:
(1) What is the trick to being able to move my Independent Corps (unassgined Flex Corps)? I infer that, I have to activate all my armies one by one, and that after all numbered armies have been activated (and moved?) then I (should) be able to move the Independent Corps? However, a couple times now it did not work this way.
During my Aug 14 turn: I had moved ALL the armies on both West and East front that I wanted to move (German, Italian, Austrian). There were a couple armies in the West that I activated, but did not actually want to move (lets say for example German VI Army), all other numbered armies and many of the independent corps had the little envelope on them.
So I clicked to activate German V Army. Then It tried to click on one of the remaining Unassigned Independent Corps, it wouldn't activate. So I clicked on the "Enact Remaining Moves" (without actually making any) and it progressed me on to the next Phase without letting me move my remaining Independent Corps.
I'm guessing that what I should have done is to: click on the activate army button for the last numbered army, then click on the activate army button a second time to "cancel activation?"