According to Sanders, what is taking place in Baskul when plane that was meant to transport people to Peshawar got hijacked? (prologue)

Sanders notes that an evacuation of civilians was taking place in Baskul when the plane was hijacked.

“Oh — must have been about a year ago. May, ‘thirty-one. We were evacuating civilians from Baskul to Peshawar owing to the revolution — perhaps you remember the business.