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Charles K says
20th-century conflicts
Soviet Marines charge the Volga river bank.During the Russian Civil War, both sides fielded warships on the Volga. In 1918, the Red Volga Flotilla participated in driving the Whites eastward, from the Middle Volga at Kazan to the Kama and eventually to Ufa on the Belaya River.
In modern times, the city on the big bend of the Volga, currently known as Volgograd, witnessed the Battle of Stalingrad, possibly the bloodiest battle in human history, in which the Soviet Union and the German forces were deadlocked in a stalemate battle for access to the river. The Volga was (and still is) a vital transport route between central Russia and the Caspian Sea, which provides access to the oil fields of Apsheron. Hitler planned to use access to the oil fields of Azerbaijan to fuel future German conquests. Apart from that, whoever held both sides of the river could move valuable troops and war machines, across the river, to defeat the enemy's fortifications beyond the river. By taking the river, Hitler's Germany would have been able to move supplies, guns, and men into the northern part of Russia.
For this reason, many amphibious assaults were brought about in an attempt to remove the other side from the banks of the river. In these battles, The Soviet Union was the main offensive side, while the German troops used a more defensive stance, though most of the fighting was close quarters combat, with no clear offensive or defensive side.
http://en.wikipedia.org/wiki/Volga_River#20th-cen… ———— Battle of Stalingrad The capture of Stalingrad was important to Adolf Hitler, and Benito Mussolini, for two primary reasons. First, the city was an important base on the transportaton route provided by the Volga River between the Caspian Sea and northern Russia. Consequently a German capture of the city would effectively sever the Soviet river link to the north http://en.wikipedia.org/wiki/Battle_of_Stalingrad ———- Kazan Operation was the Red Army's offensive (5–10 September 1918) against the Czechoslovak Legion and the KomUch People's Army during the Russian Civil War.
http://en.wikipedia.org/wiki/File:Kazan1918_08_en… http://en.wikipedia.org/wiki/Kazan_Operation