According to this document:
Area of action => 3 clearly characterized sets:
1.
West of the Vosges, a region of plateaus and
ponds with, to the south of the national road 4, the main road Paris-Strasbourg, a corridor which allows access without too many difficulties to the western edge of the Saverne gap. It is nevertheless blocked by a series of
cuts, among others the Vezouze, the white Saar, the red Saar, the Zorn, the canal from the Marne to the Rhine.
2. In the center, the
Vosges.
Mountainous barrier, covered with forests (
probably pine trees! 
). Practically excludes any easy penetration from the east. Nevertheless, at the level of the
Saverne gap, the narrowest part of the chain (about 10 km),
5 routes can be used. From north to south: the Petite-Pierre road, the Eschbourg road, the Phalsbourg-Saverne road (used by the national road 4), the Lutzelbourg road, and finally the picturesque but very rough Dabo road.
3.
East of the Vosges: the
plain of Alsace. Very dispersed habitat, based on hamlets and villages. Important cities especially on the national road 4, among others Sarrebourg, Phalsbourg, Saverne, Strasbourg.
*******
Weather:
November 1944, conditions hardly favorable for the offensive. Poor visibility. Almost no tactical aviation intervention. Incessant rainfall soaked the land, which did not facilitate the manoeuvre of the armoured vehicles off the axes.
=>
Some phases of rain or even snow during the scenario. Very little air support.
*******
German defenses:
First,
two successive lines of resistance: the "
Vor-Vogesenstellung" (or Prevosgian fortified line) and the "
Vogesenstellung" (or Vosges fortified line).
The first one runs along two rivers and is based on barricades and roadblocks. In front of this line, especially in the south, there is a series of hamlets fortified in the framework of the "hedgehog tactic", the famous German defensive tactic.
The second line follows the miltary ridge of the Vosges mountain range. It was unfinished in the autumn of 1944, except in the area of Phalsbourg... =>
Another reason to push now, despite the weather (and the lack of air support): they must not be able to entrench themselves completely!
*******
In the north, the 361st Volkgrenadier Division (VGD) and the 11th Panzer Division (PzD) will be indirectly concerned by the offensive... => But that makes potential reinforcements, plausible at least, in reserve for us during the development of this scenario!
In direct contact, there are essentially 2 German divisions:
553rd VGD (General Brühn), north of the Vezouze
708th VGD (General Krieger, replaced on November 20 by General Bleckwenn)
=> They held first the VOR-Vogesenstellung... the German HQ had foreseen that the second line would be held mainly by the units that could not hold on the first line (lack of manpower for both lines =>
all the more reason not to wait for them to bring back more defenders!)
Well, some units could move from the first line to the second at some point, but a few units defending the 2nd line from start would be a good idea, I think... (the others may very well not make it and we wish to keep some challenge up!).
& These divisions are of recent creation, formed very hastily. The 708th VGD, in particular, is based on Luftwaffe ground personnel!
Composition (mainly):
- 3 infantry regiments with 3 battalions (including 36 88mm anti-tank guns)
- 1 artillery regiment with 4 groups (36 howitzers 105 mm)
- 1 reconnaissance battalion
- 1 anti-tank battalion (another 36 88 mm anti-tank guns)
- 1 engineer battalion
=> About 8'000 men. Equipment of very unequal value, but very effective against armor (Panzerfaust - 370 per division - and the dreaded 88 mm - 72 per division).
Behind the two fortified lines of the Vosges, there is practically no organization in the depth, "it is the vacuum" until the approaches of Strasbourg (
hence the "surprise" effect there!).
Strasbourg:
defended by a series of modernized forts & with a garrison of 20'000 men (
thus more than the 2 initial divisions! 
) under the command of general von Vaterrodt, military governor of the city.
