Which of these works of fiction is based on leo tolstoy's time serving in the crimean war and set in the city where he and his military unit were based?

The work based on Leo Tolstoy's time serving in the Crimean War and set in the city where he and his military unit were based is Sevastopol Sketches.

Explanation:

Sevastopol's Sketches is a tale by Leo Tolstoy. It consists of three narratives written at different times in the Crimean War. Tolstoy acted as a second artillery lieutenant during the war, and from that experience described the war from the perspective of the combatants, detailing his reactions to extreme situations. The three parts of the work are divided into December 1854, May 1855, and August 1855.

in what story are we looking at?

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.