I am sure that this was the case. It really was like Germany and Japan vs. Rest of the world.
Historically spoken the Swedish Forces in the 30 year war fought a lot of "nations".
The Mongolian "army" in the 13th century fought its way arround the earth. The Mongolian empire was huge, from central europe to the coast of Japan. Maybe the mongolians had the most enemies, or maybe the romans. This his hard to say, because "nations" where not defined as they are today in ancient times.