Meaningful dates

While I spotted a couple of comments about yesterday being the anniversary of the battle of Tours, it also being the anniversay of the battle of Kerbala went unremarked in my very Western environment. For those who don't understand statistical coincidence, all this might seem very providential. However, my empirical observations have led me to conclude battles cluster at certain points in the seasons, even acdross the very different climates of Western Europe and the Middle East. And not necessarily where one might think.