In the first six to twelve months of a war with the United States and Great Britain I will run wild and win victory upon victory. But then, if the war continues after that, I have no expectation of success.

This quote is from Japanese military leader Isoroku Yamamoto. He predicted that in the beginning of a war with the United States and Great Britain, Japan would achieve multiple successes or victories. But after about a year, if the war continued, he believed Japan would not win. He thought it would be difficult to maintain military success over the long-term, likely due to limited resources and strategic advantages.