The Second World War damaged the city greatly. On 22 June 1941, German bombers attacked Cherkasy. For two months soldiers defended the city, but on 22 August, the invaders took the city. On 14 December 1943, Cherkasy was liberated from the German invaders. After the end of the war, the city began to recover after being almost obliterated. According to 5-year plans, the city began to re-develop its economy, infrastructure and socio-cultural sphere. In 1954 the city became the administrative center of Cherkasy Oblast (province), the youngest among other oblasts in Ukraine. In the 1960s Cherkasy became the chemical giant of the Ukrainian SSR, after "Azot" (the biggest nitrogen fertilizer producing plant), "Himvolokno" (artificial fiber manufacturing plant), "Himreaktyv" (chemical reagents for military purposes) and many others were built in the city. In 1961 a Kremenchuk hydro power plant was built, forming the Kremenchuk Water Reservoir, which Cherkasy is now standing on. This makes the city a big transport hub, serving the longest dyke in Ukraine (15 km) with rail and road on it.