Western Allies alerted to the Battle of the Bulge plan.

Inspired by the Battle of the Bulge tank thread comments regarding the failure of Allied intelligence to alert Allied supreme command to the German attack what would have happened if General Eisenhower had received convincing reports of the impending attack about one week beforehand? With just one week what could be done to prepare? It will still be the same poor weather for air support. But what units could be moved up? More artillery sited?
 
Biggest thing is the 2d 4th, 28th, 99th, & 106th Inf Did are not taken by suprise & the initial 12 hours confusion in the 1st Army are waived away.

With a weeks notice: Bradley could ease up on current attacks and detach at least two armored divisions & perhaps even two infantry divisions to form a reserve and rest a day or two. Taking a armored division from the 3rd Army would probablly be necessary to make this work. If Eisenhower releases the 82d & 101st AB Div to Bradley those could pair up with the two Arm Div to make a hefty reserve.

Hodges might choose to leave the 2d ID in place & slip the 106th in along side it. This eliminates the weak point of the 104th Arm Cav Group. On the down side it leaves the 99t ID cover the high ground of Elsenborn ridge alone. 1st Army can also have its local reserves in the form of combat commands of the 7th & 9th Arm Div rested and ready.

None of this is a pancea, but it makes for a tougher 16-17 Dec battle, & the 1st Army loses a lot less ground. The breakthroughs are smaller & few or no US units surrounded anywhere. Casualties are just as high as OTL. Hitler probablly ends the offensive a week or two earlier. No spectacular manuver & attack by 3rd Army. More likely 3rd Army executes spoiling attacks in the direction of Trier to threaten the flank/rear of the German attack & drawing off the German reserve.
 
I guess losing the element of surprise would be the most important change. Even with just a day or two warning it would allow the U.S. Army to, for example prepare artillery barrages on likely German attack corridors and if available bring in more artillery shells and other ammo.
 
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