Rostov-on-Don is situated along the Don River near its entrance into the Sea of Azov, which has been an area of great commercial and cultural importance since ancient times. It was in essence established in 1749, when a customs house was built on the Don, a major shipping lane connecting northern Russia to the Caucasus. As the most heavily industrialized city of South Russia during the Russian Civil War, it became a bone of contention between what groups? Discuss
Source: The Free Dictionary