The Armored Battalion was formed 2 Feb 1939 from the first and second armored companies (raised Mar 1935 and Sep 1936 respectively), however the companies continue to be used as independent units. The companies were used for guarding the borders and training, though elemts of the Battalion took part in the occupation of South Dobrudja. Following the Bulgarian decision to join the Axis, the battalion begins training with German troops, notably 16. Panzer-Division.
The Battalion is upgraded to the Armored Regiment 25 June 1941.

For more in-depth information, see the Employment of Armored Fighting Vehicles by Bulgaria article.

Order of battle (1939)

1. Armored Company
2. Armored Company

Order of battle (Jan 1941)

HQ
1. Armored Company
2. Armored Company
3. Armored Company
4. Armored Company
Repair Unit

Sources used

Kaloyan Matev - Armored Vehicles 1935-1945 (Equipment and Armor in the Bulgarian Army)

Reference material on this unit

Kaloyan Matev - Armored Vehicles 1935-1945 (Equipment and Armor in the Bulgarian Army)