Up until the mid 18th century the Romanian Principalities had their own army to and had relations with other states.In the 18th century the Ottomans installed puppet rulers of Greek origin called the fanariots and this lasted 'till the begining of the 19th century,s0me 90 years.In this period,yes,the armies were just bodyguards of the fanariots.If you want to argue this,you can check history:
https://en.wikipedia.org/wiki/Battle_of_Finta.....1653...Wallachians vs Moldovans
https://en.wikipedia.org/wiki/Battle_of_Khotyn_(1673)....1673...Wallachian and Moldavian troops defect to the Polish side causing Ottoman defeat
https://en.wikipedia.org/wiki/Battle_of_Călugăreni....1595 Wallachians vs Ottomans
https://en.wikipedia.org/wiki/Battle_of_Șelimbăr 1599 Wallachians vs Transilvanian Hungarians
https://en.wikipedia.org/wiki/Battle_of_Saint_Gotthard_(1664) 1664 Wallachian,Moldavian and Crimean Khanate vassals accompany Ottoman troops vs Holy League
https://en.wikipedia.org/wiki/Battle_of_Obertyn 1531 Moldavians vs Poles
https://en.wikipedia.org/wiki/Pruth_River_Campaign 1711 Russians and Moldovans vs Ottomans
https://en.wikipedia.org/wiki/Siege_of_Plevna 1877 Romanians and Russians vs Ottomans