George Patton and Omar Bradley in Germany during World War II; German POWs in US custody

The transcript describes the strategic situation during World War II where the Germans, caught between the advancing US and Russian forces, chose to surrender to the Americans. This decision was driven by their fear of Russian retribution for past brutalities, particularly at Stalingrad.

Who were the two opposing forces that created the pincer movement?

What was the fear that influenced the Germans' decision to surrender?