 Complete the following phrase:  On May 23, 1915 Italy declared war on Austria-Hungary, however the Italian front quickly became a stalemate as the Battles of the Isonzo led to heavy casualties on both sides without any major territorial gains. In an attempt to break the stalemate, on May 15, 1916 Army Group Archduke Eugen under the command of the Archduke Eugen of Austria attacked into the Trentino area in Italy. Scheuchenstuels VIII. Korps was included as part of the XI. Army which formed half of the Army Group. Initially the attacks, which became known as the 