Im thinking OK corral. We certainly wern't alone on our side of the fence. The Brits, Turks, Australians, and even the French were on our sides at the time. The French were still too mired in post war reconstruction and the growing problem in the soon to be Vietnam area to offer more than diplomatic support. The other major fighting powers of Japan, Germany, Italy were quite absent from the world scene at the time for obvious reasons. The only countries that are in a position to be grand chest thumpers are the ones with a force projectable navy or long range missiles. There are very few nations that fit that bill... or did during that era.
But then who is the lone gunman in your theory? I may just be reading you wrong.