The unit was initially formed in 1879, after the Romanian War of Independence, as Divizia Activă de Dobrogea (Dobruja Active Division).

In World War I it fought during the Battle of Mărășești where it defended the most difficult sector, being under constant attacks for two weeks.

[2][3] The land formerly occupied by the headquarters of the 34th Mechanized was given to the United States Army for a new base near the Mihail Kogălniceanu airport.

In accordance with the transformation strategy of the Romanian Army, the Dobrujan unit was reactivated on 1 October 2009 as 9th Mechanized Brigade "Mărășești", taking over control of all units in Dobruja from the former 34th Mechanized Brigade; two new subunits were also created at this time: the 911th Infantry and 912th Tank Battalion,[2] the latter equipped with T-55 tanks and Flakpanzer Gepard.

[5] The 341st Infantry Battalion, nicknamed "White Sharks", is the most experienced unit of the new brigade, with numerous international deployments, including Kosovo, Afghanistan, and Iraq.