Fifth Enemy Offensive, also known as the Battle of the Sutjeska or Fall Schwarz (Case Black). The operation immediately followed the Fourth Offensive and included a complete encirclement of Partisan forces in southeastern Bosnia and northern Montenegro in May and June 1943. The Sixth Enemy Offensive, a series of operations undertaken by the Wehrmacht and the Ustaše after the capitulation of Italy in an attempt to secure the Adriatic coast. It took place in late 1943 and early 1944. The Seventh Enemy Offensive, the final attack in western Bosnia in the second quarter of 1944, which included Operation Rösselsprung (Knight's Leap), an unsuccessful attempt to eliminate Tito and annihilate the leadership of the Partisan movement. Partisans operated as a regular army that remained highly mobile across occupied Yugoslavia. Partisan units engaged in overt acts of resistance which led to significant reprisals against civilians by Axis forces. The killing of civilians discouraged the Chetniks from carrying out overt resistance, however the Partisans were not fazed and continued overt resistance which disrupted Axis forces, but led to significant civilian casualties. Allied support Later in the conflict the Partisans were able to win the moral, as well as limited material support of the western Allies, who until then had supported General Draža Mihailović's Chetnik Forces, but were finally convinced of their collaboration fighting by many military missions dispatched to both sides during the course of the war. To gather intelligence, agents of the western Allies were infiltrated into both the Partisans and the Chetniks. The intelligence gathered by liaisons to the resistance groups was crucial to the success of supply missions and was the primary influence on Allied strategy in Yugoslavia. The search for intelligence ultimately resulted in the demise of the Chetniks and their eclipse by Tito's Partisans. In 1942, although supplies were limited, token support was sent equally to each. The new year would bring a change. The Germans were executing Operation Schwarz (the Fifth anti-Partisan offensive), one of a series of offensives aimed at the resistance fighters, when F.W.D. Deakin was sent by the British to gather information. On April 13, 1941, Winston Churchill sent his greetings to the Yugoslav people. In his greeting he stated: His reports contained two important observations. The first was that the Partisans were courageous and aggressive in battling the German 1st Mountain and 104th Light Division, had suffered significant casualties, and required support. The