. ▁On ▁ 1 8 ▁November ▁ 1 9 7 5 , ▁M IR ▁gu err illas ▁killed ▁a ▁ 1 9 - year - old ▁army ▁cons cript ▁( Private ▁Hern án ▁Pat ric io ▁Sal inas ▁Cal der ón ). ▁On ▁ 2 4 ▁February ▁ 1 9 7 6 , ▁M IR ▁gu err illas ▁in ▁a ▁gun b attle ▁with ▁Chile an ▁secret ▁police , ▁shot ▁and ▁killed ▁a ▁ 4 1 - year - old ▁car ab in ero ▁ser ge ant ▁( T ul io ▁Pere ira ▁Pere ira ). ▁The ▁Chile an ▁secret ▁police ▁on ▁this ▁occasion ▁were ▁met ▁with ▁a ▁ha il ▁of ▁automatic ▁weapons ▁fire , ▁killing ▁a ▁car ab in ero ▁and ▁a ▁girl . ▁On ▁ 2 8 ▁April ▁ 1 9 7 6 , ▁M IR ▁gu err illas ▁shot ▁and ▁killed ▁a ▁ 2 9 - year - old ▁car ab iner os ▁corpor al ▁( B ern ardo ▁Art uro ▁Alc ay aga ▁Cer da ) ▁while ▁he ▁was ▁walking ▁home ▁in ▁the ▁Santiago ▁sub urb ▁of ▁P ud ah uel . ▁On ▁ 1 6 ▁October ▁ 1 9 7 7 , ▁M IR ▁gu err illas ▁expl oded ▁ 1 0 ▁bomb s ▁in ▁Santiago . ▁In ▁ 1 9 7 8 ▁the ▁M IR ▁sought ▁to ▁re est ab lish ▁a ▁gu err illa ▁front ▁in ▁southern ▁Chile ▁and ▁launched ▁Operation ▁Return ▁which ▁involved ▁c land est ine ▁entry , ▁rec ruit ment , ▁bomb ings