The Houthi insurgency, also known as the Sa'dah Wars, was a military rebellion pitting Zaidi Shia Houthis that began in northern Yemen and has since escalated into a full-scale civil war. The conflict was sparked in 2004 by the government's attempt to arrest Hussein al-Houthi, a Zaidi religious leader of the Houthis and a former parliamentarian on whose head the government had placed a $55,000 bounty.
Initially, most of the fighting took place in Saada Governorate in northwestern Yemen, but some of the fighting spread to neighbouring governorates Hajjah, 'Amran, al-Jawf and the Saudi province of Jizan. After the Houthi takeover of the capital city Sanaa in late 2014, the insurgency became a full-blown civil war with a major Saudi-led intervention in Yemen beginning in March 2015.