From The Outsider: My Life in Intrigue, by Frederick Forsyth (Penguin, 2015), Kindle pp. 62-64:
Tangier in 1956 was an extraordinary place, my first taste of Africa and the world of Islam. Morocco had been, until very recently, a French colony, but Tangier was under tripartite administration between the British (the post office), the French (police and law courts), and the Spanish (general administration).
There was a vigorous independence movement called Istiqlal, which rioted elsewhere, but the Tangerines are known for their civility and tolerance, so Tangier was spared the rioting, at least while we were there.
…
My parents played the tourist out of the El Minzah Hotel, but I could not, like them, retire to bed at ten p.m., so I would steal back out and explore the bars and dives of the port quarter. It was here I met the Marine Commandos.
There was a British warship moored in the outer harbor on what is called a “flying the flag” mission. The idea was to spread pro-British goodwill along the African coast. It was in a dockside bar that I came across a group of Marines who were having terrible trouble making themselves plain to the bar staff, who spoke only Moorish Arabic and Spanish.
I tried to help and was promptly press-ganged as unit interpreter by the senior sergeant. They were all from Glasgow, from, I believe, Gallowgate, or the Gorbals: about five feet tall and just as wide. The problem was not between English and Spanish. That was easy. It was between English and Glaswegian. I could not understand a word they said. Eventually a corporal was discovered whom I could decipher and the three-language enigma was solved. We moved from bar to bar as they spent their shore leave and accrued pay on pints of beer and triple-scotch chasers.
Another problem, and quite a big one on a goodwill mission, was that they tended to leave each bar looking as if a bomb had gone off. I solved this by suggesting a gratuity for the staff. Contrary to rumor, Glaswegians are not stingy. When I explained the Tangerines were dirt poor, the Marines chipped in generously. But I explained to the bar staff that the extra money was the house-repair budget. Smiles all around.
Each morning, I was decanted from a taxi outside the El Minzah at about five, just in time for a short nap before joining my parents for breakfast at eight. On the third day, the Royal Navy warship weighed anchor and cruised off, taking the commandos to continue their friendship-building mission somewhere else.