War and Conflict Journal

The Sa’dah insurgency in northern Yemen began in June of 2004 with a rebellion led by the Shiite cleric Hussein Badreddin al-Houthi, head of the Shi‘a Zaidiyyah sect. Most of the fighting has taken place in Sa’dah Governorate (province) in northwesternmost Yemen.

In November of 2009, the Sa’ada insurgency took on an alarming new dimension, as Saudi Arabia openly intervened to aid the Yemeni government with air strikes and artillery barrages on the Shiite rebels.  Analysts see the Saudi participation partly as a pre-emptive strike to prevent the war from actually spreading into Saudi territory, but also as a move against Iran, which is believed to be aiding the rebels. Saudi Arabia and Iran have engaged in a long-running proxy conflict in the Gulf region, in the Iraqi civil war, and also in Lebanon, where Iran backs Hezbollah, and the Saudis support the Lebanese government.

Of interest is the fact that Saudi Arabia is aiding Yemen at all, given the fact they have a long history of dislike toward each other,  but the mutual threat from both Iran and al-Qaida (and their mutual alliance with the U.S.) appears to trump past history.

See also:

http://www.historyguy.com/Saudi_Yemen_Conflict.html

http://www.historyguy.com/yemen_saada_war.htm