Well it appears the sandwich which got its name from The 4th Earl of Sandwich, has relation to developing it for snacking at the gaming table. 

"Then in the early 1770s, the French travel writer Pierre-Jean Grosley published a gossipy and satirical book called A Tour to London; Or New Observations on England and its Inhabitants. In it, Grosely described a scene at a gambling table:"

https://www.history.com/news/sandwich-inventor-john-montagu-earl-of-sandwich

From Wiki:  The word "sandwich" appears, referring to a certain roast beef sandwich in England

Portrait of the Earl of Sandwich by Thomas Gainsborough, 1783, after whom the sandwich is named. Initially perceived as food that men shared while gaming and drinking at night, the sandwich slowly began appearing in polite society as a late-night meal among the aristocracy. The sandwich is named after John Montagu, 4th Earl of Sandwich, an eighteenth-century English aristocrat.[8][9] It is commonly said that Lord Sandwich, during long sessions of cribbage and other card games at public gambling houses, would order his valet to bring him roast beef between two pieces of toasted bread.[9] He was fond of this form of food because it allowed him to continue gambling while eating, without the need for a fork, and without getting his cards greasy from eating meat with his bare hands. The dish then grew in popularity in London, and Sandwich's name became associated with it.[8] The rumour in its familiar form appeared in Pierre-Jean Grosley's Londres (Neuchâtel, 1770), translated as A Tour to London in 1772;[15] Grosley's impressions had been formed during a year in London in 1765. An alternative is provided by Sandwich's biographer, N. A. M. Rodger, who suggests Sandwich's commitments to the Navy, and to politics and the arts, mean the first sandwich was more likely to have been consumed at his desk.

The sandwich's popularity in Spain and England increased dramatically during the nineteenth century, when the rise of industrial society and the working classes made fast, portable, and inexpensive meals essential.[16] In London, for example, at least seventy street vendors were selling ham sandwiches by 1850; during that decade sandwich bars also became an important form of eating establishment in western Holland, typically serving liver and salt beef sandwiches.

In the United States, the sandwich was first promoted as an elaborate meal at supper. By the early 20th century, as bread became a staple of the American diet, the sandwich became the same kind of popular, quick meal as was already widespread in the Mediterranean.