The Battle of Vidra was fought between the armies of the Imperial Russian Army and the Central Powers at Vidra, Romania (20 miles northwest of Focsani) in 1916 during the Romanian Campaign of World War I.
The 1st Argun Cossack Regiment, the 2nd Taman Regiment, the 59th Lublin Infantry Regiment, the 170th Molodetchensk Infantry Regiment, the 7th Bauska Latvian Rifle Regiment, the 3rd Kurzeme Latvian Rifle Regiment, the Romanian 58th Infantry Regiment (later replaced by a Russianregiment), and the 41st Selenginsk Infantry Regiment launched an offensive against the 35th Vratsanski Infantry Regiment (replaced by an Austro-Hungarian regiment), a German reserve infantry regiment (replaced by a Bulgarian regiment), the German 194th Infantry Regiment, two German reserve infantry regiments, the German 44th Infantry Regiment, an Austro-Hungarian reserve regiment, and the German 413th Infantry Regiment (later replaced by an Austro-Hungarian regiment). The Russians attempted to secure the heights dominating the battlefield, but they were beaten to it by the Central Powers, whose forces occupied the key positions and repelled several Russian assaults. The Russians were able to inflict heavy losses on the Germans during their defense of their hillside artillery positions from several waves of Austro-Hungarian and German attacks, but the Central Powers forces ultimately overwhelmed the Russian positions and held them against ferocious counterattacks. The Russians were forced to retreat after exhausting their supplies and manpower, although they inflicted heavy losses on the Central Powers in the process.