Under the command of Heinrici, parts of the army group fought through the Battle of Berlin and Battle of Halbe, with some of its elements not surrendering until the end of the war in Europe on 8 May 1945. Army Group Vistula's strength was in the region of 500,000 troops; in general, the army group was poorly equipped, many of its units being little more than the 'paper' formations typical of the German military at the end of World War II. Indeed, when first set up it was found that the army group lacked many essential facilities, such as proper maps or a headquarters signals detachment—the sole means of communication being Himmler's private telephone.