According to English Wikipedia ("Black Monday (1360)"), a severe hail happened on Monday, April 13, 1360 when the army of Edward III was camped in an open field near Chartre. The article says that the death toll was 1000 people and 6000 horses. The reference they give is on a modern book which I have no access to.
Can anyone give a primary source(s) on this event?
According to this article, and another article "Hundred Years War" in English Wikipedia, this accident had a major influence on the course of the war: Edward decided that God is not on his side anymore, and promised to conclude a peace treaty. And the peace was concluded.
It is strange however that French Wikipedia does not mention this hail storm at all. Neither it is mentioned in the "List of costly or deadly hailstorms" in the English Wikipedia. And in general, the death toll looks absolutely incredible, when compared with the records of most severe hail storms.