What unofficial ceasefires along the Western Front of World War I were described by Sir Edward Hulse in letters published posthumously?
Sir Edward Hulse, 7th Baronet:  He had his letters published posthumously detailing his account of the fighting on the Western Front, describing events such as the Christmas Truce. Christmas truce: The Christmas truce (German: "Weihnachtsfrieden" ; French: "Trêve de Noël" ) refers to a series of widespread but unofficial ceasefires along the Western Front of World War I around Christmas 1914.
The Christmas truce