Budapest service in and around Budapest, three lines of which are operated under the name HÉV. The river Danube flows through Budapest on its way from Germany to the Black Sea. The river is easily navigable and so Budapest historically has a major commercial port at Csepel District and at New Pest District also. The Pest side is also a famous port place with international shipping ports for cargo and for passenger ships. In the summer months, a scheduled hydrofoil service operates on the Danube connecting the city to Vienna. BKK (through the operator BKV) also provides public transport with boat
Siege of Budapest the old town. The Red Army, after a much-needed pause in hostilities, resumed its offensive on 19 December. On 26 December, a road linking Budapest to Vienna was seized by Soviet troops, thereby completing the encirclement. The Nazi-supported "Leader of the Nation" ("Nemzetvezető"), Ferenc Szálasi, had already fled from the city on 9 December. As a result of the Soviet link-up, nearly 33,000 German and 37,000 Hungarian soldiers, as well as over 800,000 civilians, became trapped within the city. Refusing to authorize a withdrawal, Adolf Hitler had declared Budapest a fortress city ("Festung Budapest"), which was to be defended to