This, in the end, after the defeat of Hitler, led to the situation, in the spring of 1945, when it became clear that the nuclear explosives would be available. It was then that I had a letter from Leo Szilard, suggesting that the first nuclear explosive used in the war should be used for demonstration and not for actually hurting the enemy. I went with the proposal to Oppenheimer who said, definitely, “No.” Unfortunately, I took his advice, partly because it involved no action. I was very sorry about having taken his advice, particularly when I learned later that he — contrary to the statement that we physicists should stay away from such decisions — has explicitly advocated the earliest possible use of the explosive.