In 2014, the Houthi movement, which had been waging an insurgency against the Yemeni government since 2004, began a gradual takeover of Yemen, defeating government forces in the Battle of Amran and the Battle of Sana'a (2014). Their advance continued throughout Yemen, prompting the start of the Saudi Arabian-led intervention in Yemen. The Houthis attacked Aden on 25 March 2015, beginning the Battle of Aden (2015). Despite Saudi airstrikes, the Houthis managed to take advance into the Tawahi, Khormaksar, and Crater districts. The tide turned on 14 July, when an anti-Houthi counteroffensive managed to trap the Houthis on the peninsula. By 6 August 2015, the Hadi government had captured 75% of Taiz, and the Lahij insurgency had expelled Houthis from the Lahij Governorate. Hadi fortunes dissipated on 16 August, when Houthi forces successfully counterattacked and forced the Hadi forces to retreat from Al-Salih Gardens and the Al-Dabab Mountain region. Hadi forces attributed this reverse to a lack of military equipment. In Hadramaut, Al-Qaeda in the Arabian Peninsula (AQAP) managed to take over Mukalla after winning the Battle of Mukalla (2015), and in December 2015 they took over Zinjibar and Jaar.