During the First World War Carreras sent gift parcels to the British troops which included French phrase books inside cigarette packs. These were to enable the soldiers to “get on better terms with our French allies”. In 1914 Black Cat cigarettes offered smokers a chance to collect small cardboard flags of the Allies and in 1916 the first set of cigarette cards was included in the packs. This was a set of 140 war cartoons by Louis Raemaekers which could fetch a considerable price at auction today. The next series of cards quickly followed, featuring Women on War Work. This was succeeded in 1915 by a series on the Science of Boxing.