What are the main themes of Returning We Hear the Larks by Isaac Rosenberg?

"Returning We Hear the Larks" by Isaac Rosenberg explores themes of futility, sacrifice, and the harsh realities of war. The poem conveys the sense of soldiers facing death and destruction while also finding moments of beauty and connection in the midst of chaos. It reflects on the human experience of war and the contrast between nature's beauty and the brutality of conflict.