The Mons pocket probablly exceeded the Elster column by 50,000 men. The source I recall placed some 70,000 Germans trapped there by the US First Army. But I am unsure if there was a formal surrender document. The Mons pocket did not comprise a organized group, but rather a aggregation of fragmented battle groups & support columns that converged on Mons. the several generals trapped there Wasted little time in surrendering.

In theory the German group in the Mons pocket had the ability to hold for a week or two & attack east to breakout. But, morale was different than on the Russian Front, and as with the Elster column Allied air strikes were making things 'difficult'.