▁organization . ▁The ▁latter ▁were ▁in ▁favour ▁of ▁the ▁old ▁tact ics ▁of ▁inc urs ions ▁by ▁armed ▁bands ▁in ▁Y ug oslav ia ▁and ▁Greece , ▁whereas ▁the ▁former ▁fav oured ▁more ▁flexible ▁tact ics , ▁with ▁smaller ▁terror ist ▁cells , ▁carrying ▁select ive ▁assass in ations ▁of ▁public ▁figures . ▁The ▁conflict ▁grew ▁into ▁a ▁leadership ▁struggle ▁and ▁Mih ail ov ▁soon , ▁in ▁turn , ▁ordered ▁the ▁assass ination ▁in ▁ 1 9 2 8 ▁of ▁a ▁rival ▁leader ▁of ▁the ▁older ▁group , ▁General ▁Aleks and ar ▁Pro t og er ov , ▁which ▁spark ed ▁a ▁frat ric idal ▁war ▁between ▁" M ih ail ov ists " ▁and ▁" Pro t og er ov ists ". ▁The ▁less ▁numerous ▁and ▁ill ▁equ ipped ▁Pro t og er ov ists , ▁soon ▁became ▁al lied ▁with ▁Y ug oslav ia ▁and ▁certain ▁Bulgar ian ▁military ▁circles ▁as ▁Z ven o , ▁who ▁fav oured ▁rapp ro ch ement ▁with ▁Y ug oslav ia . ▁That ▁period ▁led ▁to ▁intens ification ▁of ▁the ▁armed ▁struggle ▁of ▁the ▁organization ▁in ▁A ege an , ▁and ▁especially ▁in ▁V ard ar ▁Mac ed onia . ▁A ▁total ▁of ▁ 6 3 ▁terror ist ▁acts ▁and ▁attacks ▁on ▁brid ges , ▁w are h ouses , ▁Ser bian ▁police ▁stations ▁and ▁military ▁targets ▁were ▁undert aken ▁between ▁ 1 9 2 2 ▁and ▁ 1 9 3 0 , ▁the ▁number ▁of ▁assass in ated ▁Ser bian ▁officials ▁and ▁collabor ators