This is called trench warfare!
The name comes from the trenches, that is the ditches that the soldiers built.
This warfare was typical in the First World War and it led to frequent stalemates: the trenches are easy to defend but hard to attack so for long periods of times the front remained stable.
The correct answer should be Finland. He was hiding in Finland near his return to Petrograd, that is St. Petersburg. He decided to return to Russia when the Soviets gained a majority in Petersburg and he wore a disguise and crossed the border into Russia from Finland.
Not necessarily. Assuming you are talking about the American Civil War, one of the only things that kept the south from capturing Washington D.C. was a note being intercepted and southern plans being known by the north.
