"Zemlyanka" was the name for a German-Soviet War song written by Alexey Surkov (verses) and Konstantin Listov (music) in 1941 during the Battle of Moscow.
In November 1941, Alexey Surkov (who became a war correspondent of the Krasnoarmeyskaya Pravda newspaper at the very beginning of the Great Patriotic War) came under fire from German infantry near the Kashino village along with 258th Rifle Regiment.
Having broken through the offensive and crossed the river on thin ice under mortar fire, Surkov found that his overcoat was all cut by shrapnel.
The Chief of Staff fell asleep right at the table, as he had not slept for four days; the others settled down near the stove, someone started playing the accordion.
The entire poem was mentioned in the 2005 Canadian historical novel, Four Steps to Death, by John Wilson, in which Red Army soldiers sing it on the way from Moscow to Stalingrad (present-day Volgograd).