Since forces from the rear could not move forward quickly enough to take place in the titanic battles being envisioned, everyone had to be placed as close to the front lines as possible. The result was a new battlefield organization that moved the vast majority of US and allied forces much closer to the border between East and West Germany, in what became known as "forward defense". As reinforcements from the US could play only a minor role, the war was a "come as you are" affair. Air power was key; as the battle increased in tempo and the Soviet forces attempted to break through the defenders, channels would naturally form that would be attacked by air.