north–south. The 342nd Infantry Division arrived to Srem in period between 19 and 21 September. The rebel Attack on Šabac that began on 21 September 1941 has hastened the military engagement of the 342nd Infantry Division. The operation began on 24 September 1941, with the arrival of the 342nd Infantry Division which attacked rebel forces used during the attack on Šabac. According to some indications, the Partisans retreated from Šabac on 24 September 1941 while Račić and his Chetniks continued with the battle until 26 September 1941. Some authors like Miletić refer to the first three days of combat engagement of the 342nd Infantry Division as part of the Attack on Šabac, emphasizing that the operation Cleaning Up the Sava Crescent began on 28 September 1941, while other sources emphasize that the operation started on 24 September 1941. The 342nd Infantry Division immediately targeted not only rebel armed units, but also civilian population. The 125th Infantry Regiment advanced from Belgrade through Obrenovac toward Ub and Valjevo. The 699th Infantry Regiment crossed Sava near Šabac during the night between 28 and 29 September while the 697th Infantry Regiment crossed Sava near Mačvanska Mitrovica. On 29 September the 699th and the 688th regiments advanced with broad frontline from Šabac toward Loznica while 697th regiment advanced from Mačvanska Mitrovica toward village Lipolist. Between Bogosavci and Dobrić the German forces were ambushed by group of Chetniks who retreated toward Dobrić when their commander was killed in this action and after the German forces received airplane support. On 30 September the Hungarian Danube river fleet destroyed villages Debrc and Novo Selo with artillery fire. When some rebel units tried to halt German advances near the cemetery in Majur "many Chetniks and Partisans died in battle with Germans". The operation ended with failure. The main rebel forces and their headquarters retreated in front of German forces and avoided being captured or destroyed. On 7 October Böhme concluded that rebels escaped in front of the 342nd Infantry Division to Cer and south of it and issued an order to complete all preparations in the evening of 9 October to attack rebels on Cer and Iverak in dawn of 10 October 1941. "Cer—Iverak" On 10 October 1941 the Partisan pioneer unit retreated from Cer and arrived to Draginac and damaged the wooden bridge across river Jadar on 11 October. The rebel forces fortified on the hills near Draginac,