Since Yemen was unified in 1990, successive governments have claimed that the country can be governed as one, a right that a number of rivals currently contest. Yet the number of guerrilla wars fought in the country’s north in the last hundred years show that the old cliches about Yemen are at least partly true. The secret of these insurgents lies in their support, which goes beyond the local. They, like the Houthis today, owed a great deal of their military success to the aid of outside powers willing to supply the materiel and expertise required to make fighting effective and sustainable. Do you think that most insurgent groups are backed up by foreign powers ?