How does Ernest Hemingway use imagery in For Whom the Bell Tolls?

Hemingway places images of nature within the text to contrast the destruction that is war, and to create a visible contradiction. Pine imagery, specifically, plays an integral role in the novel, functioning as a steadfast symbol in a world that spins with many changes in a span of just a few days. It becomes a control variable, the base that all in the text relies on. Furthermore, pine trees are objects that Hemingway utilizes to exhibit the role of mother nature. Within the work, pine serves as a constant shelter, base of relationship, and stimulant of Jordan becoming one with nature in a perpetual environment that is brought by discontinuity throughout the text.