The Yugoslavians had 2 tank battalions formed and a 3rd being formed in Russia to be equipped with BT-7 tanks.
The I Bataljon bornih kola (I Bbk) had 48 FT-17s and NC-27s. Also a squadron of 8 S-Id tankettes.
The II Bbk was to be equipped with 50 R-35s. Some of these may not have arrived before the fall of France.
After the fall of Yugoslavia the partisan units formed and some were able to capture tanks from the occupation troops. The first was a H-39 in September 1941. Other tanks captured were R-35s, CV 33s, CV 35s, and S-35s.
The partisans formed the 1st Tank Brigade in July 1944. The British delivered 75 M3A1 and M3A3 Stuart tanks and 24 AEC Mark III & IV armored cars at Bari on the Italian Adriatic coast. The brigade was landed on the Dalmatian coast in November 1944. It its fight to Trieste several Stuarts were converted to carry German PaK40 75 mm guns or quad FlaK38 20 mm anti-aircraft guns.
In Russia the 2nd Tank Brigade was formed with 65 T-34/85s. The unit took part in the fight for Zagreb and met with the 1st Tank Brigade in Trieste.