Yemen: The Siege of San'a

Prince Mohamed ben Hussein, commander of the Royalist army, sat on a carpet spread in front of the mountain cave that has been his headquarters for most of Yemen's five-year civil war. Before him were the turbaned chiefs of the country's most powerful tribes, summoned for a council of war. At long last, announced Ben Hussein, his army was ready to launch a march on San'a —the final offensive, he hoped, that would retake the capital and finish off the Republican regime.

"We have money," he told his guests, "and you will have your share if you join us. If...