Despite certain tactical successes (breaking up of the 7th Mountain Regiment on May 21 and the 13th Mountain Regiment on May 24), after a flanking attack by parts of the 369th Division near Gradac on May 25, this attack proved hopeless. From there, on May 27, the Supreme Headquarters ordered the transfer of all forces to the left bank of the Tara. The 118th Jäger Division had the task of breaking out on Piva from the west and blocking it. On May 22, her 738th Regiment, without contact with Partisan units, broke out on Vučevo, a plateau west of Piva. However, they could not organize communications and supplies in this wide and impassable area, so the regiment commander, lieutenant colonel Anacker, sent one battalion to the south to establish a connection with the 7th SS Division, and one to the west, to connect with the headquarters of his division. The remaining, 2nd Battalion, in a battle on May 29, was repelled from dominant positions by the two battalions of the 2nd Proletarian Brigade. The intervention of parts of the division from the north, across the Drina, was suppressed by the forces of the 1st Proletarian Division, which moved across the Tara. Thus, the Partisan forces firmly occupied Vučevo and prevented the Germans from closing the ring on Piva. The next natural obstacle on which the 118th Division could do that was valley of river Sutjeska. On May 18, the 7th SS Division and the Italian Division Ferrara began to appear from the south towards Šavnik, Žabljak and Mratinje. The successful defense of the First Dalmatian and the Fifth Montenegrin Brigades, which suppressed the appearance of the right wing of the 7th SS Division and the Italians, enabled the organization of an attack on the left wing of the 7th SS Division. Phase III: Arrival of British mission (27 May – 3 June) Informed on May 20, 1943 of the arrival of the British military mission, the Supreme Headquarters left Đurđevića Tara and settled in the forest near Black Lake, at the foot of Durmitor. On the night of 27/28 May, the British Liaison Department arrived. At the head of this mission were Captain William F. Stewart, who worked at the British Consulate in Zagreb before the war spoke Serbo-Croatian, and William Deakin, a history professor at Oxford. In addition to the two of them, the mission had 4 more members.