 In early November, Arsenije III met with Habsburg commander-in-chief, General Enea Silvio Piccolomini in Prizren; after this talk he sent a note to all Serb bishops to come to him and collaborate only with Habsburg forces.As the tide turned in 1690, and Turks advanced through Serbia, Arsenije retreated with the Austrian army and 60–70,000 Serbs (about 37,000 families) to the north, in an episode later named the "First Serbian Migration" of the "Great Serb Migrations".In April, Emperor Leopold issued his "Letter of Invitation", in which he invites Serbs and other Balkan nations on the run to come to the Habsburg Monarchy.