Trojan Horses in Vietnam

Small Wars, Faraway Places by Michael Burleigh is a goldmine of interesting details.

Discussing the First Vietnam War between the French and the Vietnamese in the early 1950s, Burleigh makes a dreadful pun.

Although there were itinerant brothels, staffed by brave and colourfully dressed women from the Algerian Ouled Nail tribe that honoured the activity as a way of earning matrimonial dowries, many French troops acquired a permanent congai or common law wife, a popular practice too among their Vietnamese comrades, who simply moved their real wives into camps de maries. The vulnerability this created was manifest, and a third of the French posts that fell were betrayed from within by Viet Minh Trojan whores.