Less than ten months after the initial uprisings that forced Ali Abdullah Saleh to step down as president, hundreds of Salafi and Houthi fighters had been killed, thou¬sands injured, and many homes, hospitals, schools, markets, and even mosques attacked. Because this sectarian violence took place in the context of preexisting tribal feuds and revenge conflicts, it has resulted in an alarming escalation of collective violence and instability that is aggravating Yemen’s constellation of radicalization and militancy.