Why was control of archangel petrograd and rostov important?

Control of Archangel, Petrograd (now St. Petersburg), and Rostov was crucial during the Russian Civil War due to their strategic locations and economic significance. Archangel served as a vital port for Western supplies, while Petrograd was the former capital and a key political center. Rostov was important for its railway connections, facilitating troop movements and supply lines. Overall, capturing these cities allowed factions to assert dominance and control over critical resources and infrastructure.