There is some evidence that Napoleon's troops introduced Tarot, in the form of Droggn – a Tarot game with similarities to old French Tarot – into Austrian Tyrol. It is also recorded that French soldiers were issued with Tarot packs during the Franco-Prussian War (1870), First World War (1914-18) and Algerian War (1954-62), leading in each case to the spread of "le jeu de Tarot" throughout France according to Dummett and Berloquin. In 1973, the French Tarot Federation ("Fédération Française de Tarot") was formed and, by the late 20th century, Tarot had become the second-most popular card game in France, only trailing Belote. Part of the reason why French Tarot persisted is the fact that the rules have been very consistent wherever the game is played. However, it is important to note that details of gameplay outside of officially sanctioned tournaments may vary from circle to circle so that the known rules and terminologies are more typical than definitive.