My english is very bad. In german I would write much more
I play at the lowest gamespeed. I think it's usefull to watch every detail. When I change a commander, then I split the stack, so the penalty of a commander change of 20% Org is only at one unit. Then I add further units to this stack. When I use the offensive option, I only do it when the unit stands and don't move or attack. The cost of supply and fuel for the offensive option is much higher when choose during combat or moving. It looks like an bug in the game.
In this campaign (Allis vs. Axis) I collect the tanks from the southeast under Patton in Liége. I leave four Inf-Div. in Mülhausen and six in Straßburg. The mountainier also went to Straßburg, and one HQ. The other units from southeast went to Luxemburg, Bastogne and Liége. The tanks from Paris went to Antwerpen, the Infanterie to Lille. The tank in Aachen went to Eindhoven, also the Infanterie, but apart. My first goal was to hold Eindhoven. In Antwerpen, I use engineer generals. They are for the attack at Utrecht. Montgomery is placed in Lille to attack Dünkirchen.
When Dünkirchen is taken, the Infanterie went to Gent. When Eindhoven is secure, I attack Utrecht to cut of Rotterdam and Amsterdam. Then, I attack Rotterdam and move with the Infanterie from Gend to Rotterdam. Then I destroy the units in Amsterdam, but don't move into this province. Because I try to conquer all provinces, so I don't want to get to much victory points.
On the other side, I attack Köln from Liége, Bastogne and Luxemburg. Of course, I have Montgomery use for this attack. It's very important that strong units reach Köln at the same time. So I have plan the attack carefully. The units that take Rotterdam are also send to Liége and then to Köln. Our next goal is Saarbrücken. The attacking units from Straßburg needs Montgomery, and the attacking units from Köln and Luxemburg needs engineer generals. By this attack, also strong units must reach Saarbrücken at the same time to hold it. It's extremly bad to lost a conquerd province. From Saarbrücken I went to Frankfurt. It was difficult for me to hold it, but I had luck. Then I took Aachen back. The units from Antwerpen and Lüttich can then send into this province. Then I attack Dortmund with strong forces to secure that the AI is unable to throw me out of this province. Than I attack Essen, but I don't went into it. I the south, I attack Stuttgart. Here I have my biggest problems. I attack several times, but always to early. The Org of my units were to low. Strange, the units in Stuttgart don't went out of supply?
The north were much easier, from Utrecht and Eindhoven, I attack Arnheim and so on. the last province in the north was Hannover. In the south I had very hard fights. When I smash the last german forces in Friedrichshafen, I look when my units will arrive in Friedrichshafen. I planned the time to take undefended Essen and Amsterdam and send the units, so they will arrive one hour after the occupation of Friedrichshafen. Without the 18 victory points of Essen and Amsterdam I can't reach a strategic victory and therefore the game doesn't end before 2. march. So I can secure, that I was able to counquer all provinces.
I think, very important was to use the engineer generals to attack across rivers and to attack only when it's save that you can hold the attacked province. Further, to look when the units are ready with their relaxing time, so you don't waste time. And change commanders only for one unit, so the penalty of 20% Org losses are only for one unit.
I am surprised, that the AI don't use the offensive option. Even when I play Axis vs. Allies and the AI have enough supply, he don't use this option, that's stupid. The AI losses also through disappearing, retreating units, that never arrives in other provinces. That seems to be a bug and must be fixed.
Viele Grüße Jimmy