During the Polish-Soviet War of 1920 the city of Lwów (modern Lviv, Ukraine) was attacked by the forces of Alexander Ilyich Yegorov. Since mid-June 1920 the 1st Cavalry Army of Semyon Budyonny was trying to reach the city from the north and east. At the same time Lwów was preparing its defenses. The inhabitants raised and fully equipped three regiments of infantry and two regiments of cavalry as well as constructed defensive lines. The city was defended by an equivalent of three Polish divisions aided by one Ukrainian infantry division. Finally after almost a month of heavy fighting on August 16 the Red Army crossed the Southern Bug River and, reinforced by additional 8 divisions of the Red Cossacks, started an assault on the city. The fighting occurred with heavy casualties on both sides,