12th Army GP
III Corps
XXIII Corps
1st Army
3rd Army
By 1944, when the 528th FABn was activated, the Army had made a very pivotal decision to ensure success in the European Theatre of Operations (ETO). Artillery Battalions would not longer be attached to Divisional command. Instead, from 1943 onward, Artillery would be assigned to the Corps level command, allowing the maneuverability and flexibility to support all Divisions where the action was taking place.
This partly answers why many Artillery Battalions were hard to trace through 1945 in the ETO. Supporting the Corps level command meant responding to action in the ETO to support any army, division, or unit that required heavy artillery retaliation and therefore not as easily traced as a Divisonal battalion would be.
Another reason that very little material exists for the 528th specifically, was the fact that the Battalion was created in early 1944 and was disbanded in 1946. In this short time, very little was recorded of the newly formed unit until after WWII.
Although the 528th mostly served under the umbrella of the III Corps between the 1st and 3rd Armies during the Rhineland & Central Europe campaigns in '45, they were also dispersed where needed throughout Feb to June 1945.
My research focused predominately on the Battery B, for which my Grandfather served, so I cannot speak for the other two Batteries of the Battalion. I obtained the unit reports where there is a wealth of info. While in the UK, the B-Battery headcount was 35 Private-First Class and 43 Privates. They do not mention Tec/5, Corporal or ranks above for numbers.
Below you will find a simplistic rendering of the Battery B - 528th through Europe, in a map I put together. An accurate description follows.
Below you will find a summaries of 528th-Battery B through Europe '45:
While I cannot locate a unit picture of the B-Battery 528th FABn, here is a photo found online of the C-Battery.