ORIGINAL: Central Blue
4th Armored has a much better chance of relieving Bastogne if you add the 253rd and 274th AFA, 177th and 776th 155H, 559th and 561st 155G, and 578th 8H.
Except for the 253rd and 274th, my sources showed most of these FAB's deployed further to the East, some even as far away as 4th Infantry Division sector. I'll look into this a bit more, thanks.
I recommend Armor at Bastogne: A Research Report Lt Col. Robert R. Summers, et. al., General Instruction Department, The Armor School, 1949. A digital copy is on line at the Combined Arms Library. It led me to the 402nd Artillery Group. And it confirms the 177th and 776th (as well as the 253rd and 274th) listing in the order of battle published by the ETO Office of the Theater Historian. Great maps too. Their source for the artillery line up was the G3 journal of the 4th Armored.
The ETO OOB can be contradictory, and incomplete, so I always look for backup. For example, they show the 177th, 253rd, and 775th directly attached to the 4th Armored through December 31, but also as part of 193rd artillery group attached to the 6th Armored starting December 29. But that doesn't affect the Battered Bastards scenario.
Widening the Corridor is a bit of a jig saw puzzle though. I assign the assets to whom they ended up with, like the companies from 3rd Chemical Mortar going to the 134th and 137th; and then make arbitrary decisions on which of the two 155(H) battalions attached to the 101st is firing south, and which north.
BTW, CARL also has the original report by Marshall, et. al., that became Bastogne, The First Eight Days.
USS St. Louis firing on Guam, July 1944. The Cardinals and Browns faced each other in the World Series that year