This passage describes the emotional toll of trench warfare on soldiers during the war, and suggests that the trauma will have long-lasting effects on their mental health even after the war has ended.
Despite the horrors that they witness, the soldiers continue to fight and persevere through the pain. The passage acknowledges the difficulty of overcoming such traumatic experiences, but expresses hope that the soldiers will eventually be able to return to some semblance of normalcy once the war is over.