Not something I've ever given a lot of thought to, beyond reading a book on The Wipers' Times as a teenager. What prompted this wee search was a post on a FB group I belong to about ye-ye music and Sixties culture generally. It was a photo of the front cover of a French satirical magazine called Le Crapouillot (The Toad) from about 1966, and the issue was devoted to LSD and other fashionable drugs. Originally published as a trench paper by Jean Galtier-Boissiere in 1915, it was known for it's satirical content from the beginning, and had become a right wing organ by the '60s. It closed in 1996. According to this article, although the French, British and German armies comprised the bulk of trench papers, other armies knew them too. Soldier Newspapers | International Encyclopedia of the First World War (WW1)