The true events behind '1917' are likely to be centered around the events of World War I in that year. It could be about the movement of troops, the supply lines, or the communication challenges. It might also be about the impact of the war on the civilian population near the battlefields. There could be real - life incidents of soldiers getting lost in the unfamiliar terrain, or having to make split - second decisions that could change the course of their lives and the outcome of small - scale military operations. This movie uses these real - life elements to create a vivid and engaging story on the big screen.