 Complete the following phrase:  However, during the course of time, with centralisation and changes to state structure, the economic system and military organisation occurring, many of the services that the Vlachs used to provide for the Ottomans became superfluous. As a result, the 1520s saw the beginning of Vlach sedentarisation and a reduction of their privileges. By the end of the 16th century, these privileges resulted in the majority of Vlachs social standing being equalled to that of the filurîci, and later with ordinary reaya peasants. Lastly, the sound Ottoman defeat at Sisak in 1593 triggered the beginning of loss of faith by these Vlachs, both genuine Vlachs and Serbs in those who until then had been their masters, and propitiated the passing of the Vlachs and the Serbs over to the Habsburg side see 