The most important lesson in the history of our humanity. That is surpassed in a genre, religion among other moral aspects, is simply the survival of the species or a human being in question. Our most basic instinct is survival and when we unite. Forgetting our differences (as a group of Individuals, not nations), for the sake of our survival and our well-being, the human race shines in the most intense sense possible. The cooperation between several elements, to come out alive from a complicated situation.
One scene, caught my attention when a group of Allied soldiers was surrounded in a ship and this same ship was being attacked on all sides by the German troops. One of the characters was being forced out of the ship. To see if the tide sea was rising or not. Out of fear, this character did not want to leave the ship. It was when an English soldier replied: for the others to survive, one person has to die.