 Complete the following phrase:  Initially, Böhme planned to cross river Drina with 342nd division and to destroy rebels in the Mačva region attacking them from south toward north. He changed his mind because he was concerned that this tactic would expose flanks of the 342nd division to attacks of rebel forces from mountain Cer-Iverak. Based also on the proposal of Kvaternik, who pointed to the experience from the 1914 