For nearly five months, Yemen’s Houthi rebels sat on the sidelines as their main backer, Iran, weathered devastating U.S. and Israeli attacks. That changed in recent weeks with a r

For nearly five months, Yemen’s Houthi rebels sat on the sidelines as their main backer, Iran, weathered devastating U.S. and Israeli attacks. That changed in recent weeks with a resumption of fighting between the Houthis and Saudi Arabia.