What is the meaning of behind the lines and back at home?

"Behind the lines" typically refers to areas in a conflict zone that are not at the front lines of battle, often associated with support roles or civilian life during wartime. "Back at home" indicates a return to one's place of residence or a sense of normalcy away from the conflict. Together, these phrases evoke the contrast between the experiences of those engaged in conflict and those living in safety, highlighting themes of separation and the impact of war on both soldiers and civilians.