The Battle of Azzano was one of the many battles during World War II. Future Howling Commandos Bucky Barnes, Dum Dum Dugan and Gabe Jones were overwhelmed by a battalion of HYDRA soldiers sent by Johann Schmidt, and most members of the 107th Infantry Regiment and other regiments were either killed or captured.
Johann Schmidt and HYDRA began to separate themselves from Nazi Germany. When Adolf Hitler had enough of Schmidt's disobedience, he sent Schneider, Hutter and Roeder to the HYDRA Headquarters to confront him. Schimdt killed them with his new Tesseract powered HYDRA Cannon.
Bucky Barnes, Gabe Jones and Dum Dum Dugan, among other members of the United States Armed Forces, were in a foxhole battling German soldiers when a battalion of HYDRA soldiers sent by Johann Schmidt arrived.
One of the HYDRA Uber Tanks fired upon the German troops, completely wiping them out. The Tank turned its cannon on the Allied soldiers and fired on them. The remaining Allied soldiers surrendered and were taken prisoner.
The prisoners were taken to the Austrian HYDRA Weapons Facility and forced to work in the factory making Tesseract powered weapons. Captain America infiltrated the facility and liberated the prisoners.