Principality of Dacia

The  Grand Duchy of Dacia in certain versions is a direct reference to the Latin name that was given to ancient Romania/Bessarabia. According to Tanya's knowledge, Dacia is a minor state that had yet to have a modernize.

It is a nation with a military from a bygone era. They attempted to invade the Empire without any air or artillery support. Their vanguard force was thrown into turmoil by Tanya Degurechaff's flight wing.

The Dacian War ended shortly as the Imperial Army routed the Dacian force with with the unprecedented odds of 70,000 against 600,000. Dacia is overrun in six weeks. By the time Orse Fryord fell, the Empire had already established full control of Dacia and was smoothly setting up their administration.

International Relations
Little is known about their diplomatic relationships with other country, but Tanya suspected their declaration of war was most likely incited by either the Republic or other nations that would have benefited if Empire had to fight a three-front war.

Francois Republic (フランソワ共和国) Their Carbellius weapon factory is mentioned as a facility sponsored by the Republic. Just like Legadonia, Dakia received military support from their allies to an extent.

Military Strength
The military of Grand Duchy of Dacia was still stuck in a late-19th century paradigm. As evidenced by the Dacian War, their military strenght is far inferior to those of thier contemporaries.They still employed line infantry and armed with conventional turn-bolt rifles. They have no known air capabilities nor any defenses against aerial assaults. No Dacian artillery forces are known to exist, despite having an artillery munitions factory.

Trivia

 * On the maps that show up in the background of the anime, the country's name shows up as "Grosherzogtum Dacia" in a highly stylized font.
 * In the anime, the weapon making scene inside their weapon factory shows a worker making artillery shells.