Leo Tolstoy then spent much of his time in Moscow, Tula and Saint Petersburg, leading a lax and leisurely lifestyle. He began writing during this period, including his first novel "Childhood", a fictitious account of his own youth, which was published in 1852. In 1851, after running up heavy gambling debts, he went with his older brother to the Caucasus and joined the army. Tolstoy served as a young artillery officer during the Crimean War and was in Sevastopol during the 11-month-long siege of Sevastopol in 1854–55, including the Battle of the Chernaya. During the war he was recognised for his bravery
Leo Tolstoy claimed the first example of a coherent theory of democratic education. The death of his brother Nikolay in 1860 had an impact on Tolstoy, and led him to a desire to marry. On September 23, 1862, Tolstoy married Sophia Andreevna Behrs, who was 16 years his junior and the daughter of a court physician. She was called Sonya, the Russian diminutive of Sofia, by her family and friends. They had 13 children, eight of whom survived childhood: The marriage was marked from the outset by sexual passion and emotional insensitivity when Tolstoy, on the eve of their marriage, gave her