I believe that Congress could declare war, (though states could, ahem, not draft soldiers), could sign treaties and trade agreements
yea, i think that's it, since there are much more weaknesses to the Articles of Confederation than strengths....
In Western Europe, the war was largely a stalemate as a result of extensive trench warfare that gave the defenders a massive advantage during battles. In Russia, however, the monarchy was overthrown by rebels, who then negotiated peace and surrendered large chunks of land to the Germans, allowing them to concentrate all their troops and resources to the Western Front.