▁Aust rian ▁troops ▁retired ▁across ▁the ▁Dr ina , ▁ending ▁the ▁First ▁Aust rian ▁In vas ion ▁of ▁Ser bia . ▁The ▁First ▁Battle ▁of ▁L emberg ▁ ▁began ▁in ▁Gal icia ▁and ▁the ▁Battle ▁of ▁Kom ar ów ▁ ▁and ▁the ▁Battle ▁of ▁G n ila ▁Lip a ▁ ▁began ▁in ▁Poland . ▁A ▁naval ▁action ▁took ▁place ▁off ▁the ▁Å land ▁Islands ▁and ▁a ▁German ▁cru iser ▁S MS ▁Mag de burg ▁ran ▁a ground ▁and ▁was ▁intercept ed ▁by ▁a ▁Russian ▁squad ron . ▁ ▁On ▁ 3 ▁September , ▁L emberg ▁was ▁captured ▁by ▁the ▁Russian ▁army ▁and ▁the ▁Battle ▁of ▁R awa ▁( B attle ▁of ▁T arn av ka ▁ ▁began ▁in ▁Gal icia . ▁The ▁First ▁Battle ▁of ▁the ▁Mas ur ian ▁L akes ▁ ▁began ▁and ▁on ▁ 8 ▁September , ▁the ▁Aust ro - H ung arian ▁army ▁comm enced ▁the ▁Second ▁In vas ion ▁of ▁Ser bia , ▁leading ▁to ▁the ▁Battle ▁of ▁Dr ina ▁ ▁The ▁Second ▁Battle ▁of ▁L emberg ▁ ▁began ▁and ▁on ▁ 1 1 ▁September , ▁Aust rian ▁forces ▁in ▁Gal icia ▁retre ated . ▁The ▁Battle ▁of ▁the ▁Mas ur ian ▁L akes ▁ended ▁on ▁ 1 5 ▁September ▁and ▁Cz ern ow itz ▁in ▁B uk ov ina ▁was ▁taken ▁by ▁the ▁Russian ▁army . ▁On ▁ 1 7 ▁September , ▁Ser bian ▁forces ▁in ▁Sy rm ia ▁were ▁with dra wn ▁and ▁Sem lin ▁ev acu ated , ▁as ▁the ▁Battle ▁of ▁the ▁Dr ina