Triton metaphor

Triton | Greek mythology | Britannica

I think that there might be some sort of metaphor hidden in the book. The metaphor would be the Triton fountain. Let me explain why; in the beginning the fountain is especially important because some key events happen there. In part three, the last part of the book, Briony gets a letter from her mom saying that a kid broke the fountain. He snapped of an arm and later the arm, who was supposed to be glued back on, was missing. Briony gets this letter during the war, I think that the breaking of the fountain could stand for the war because when there was no war the fountain was just fine and then the war started and it broke. The missing of the arm could stand for the aggravation of the war, because at the time the situation only gets worse.