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I think German command failures during the campaign in the west are pretty well known: Moltke didn't keep a tight reign on the left wing, the Army commanders often worked at cross purposes and in the end 1st Army was attacked in the flank while a gap opened between 1st and 2nd Armies at the Marne.
By April 1915 German command structures had evolved: Ober Ost was stood up to command the 8th and 9th Armies on the Eastern Front in Nov 1914 and the first HeeresGruppe (Army Group) was stood up in April 1915 to command a German and AH Army on the Eastern Front. Within Armies the Germans formed ArmeeGruppe, placing a number of Corps/divisions under one commander while still under the command of the parent Armee, in addition they created ArmeeAblietung which was like an ArmeeGruppe but outside the command of a parent Army and thus like a small Armee level command itself. The first ArmeeAblietung were created in 1914 from units remaining on the right wing once units were sent to fight in the Race to the Sea. In practice a Heeresgruppe commander would also command his own Armee, but often this Armee had one or two ArmesAblietung in it so his span of control wasn't too big: his own arm with an AB plus a couple of Corps and the other Armee, 4 or so subordinate units.
What I'm wondering is:
If this sort of thing was available to Moltke before August 1914, with all else being equal, c/would it have had much impact on the offensive through Belgium into France and avoided the problems that lead to the defeat on the Marne?
Who would be the HG commander and if their Armee had an AG would it have performed its tasks better?
What AAs would be required and who would command them?
Anyone got anything else that might have happened?
From Wiki for reference.
Armee-Abteilung or Army Detachment in the sense of "something detached from an Army". It is not under the command of an Army so is in itself a small Army.
Armee-Gruppe or Army Group in the sense of a group within an Army and under its command, generally formed as a temporary measure for a specific task.
Heeresgruppe or Army Group in the sense of a number of armies under a single commander.