On 26 March 2015, Saudi Arabia, leading a coalition of nine countries from West Asia and North Africa, staged a military intervention in Yemen at the request of Yemeni president Abdrabbuh Mansur Hadi, who had been ousted from the capital, Sanaa, in September 2014 by Houthis during the Yemeni civil war. Efforts by the United Nations (UN) to facilitate a power sharing arrangement under a new transitional government collapsed, leading to escalating conflict between government forces, Houthi rebels, and other armed groups, which culminated in Hadi fleeing to Saudi Arabia shortly before it began military operations in the country.
The first month of the intervention, codenamed Operation Decisive Storm (Arabic: عملية عاصفة الحزم, romanized: Amaliyyat 'Āṣifat al-Ḥazm), consisted of airstrikes on Houthi rebels and a full blockade. On 22 April, the Saudi-led coalition declared that it had achieved its initial goals and announced Operation Restoring Hope, which would comprise a "combination of political, diplomatic and military action" while continuing "to prevent the Houthi militias from moving or undertaking any operations inside Yemen". Ground forces were subsequently deployed into the country as part of a broader offensive against both Houthi militants and loyalists of Hadi's predecessor, Ali Abdullah Saleh. Owing to Iran's support of these factions, the conflict is widely regarded as part of the broader Saudi-Iran proxy conflict.
Egypt, Morocco, Jordan, Sudan, and the United Arab Emirates provided air and ground forces, while Kuwait, Qatar, Bahrain, and U.S. private military contractor Constellis headed several ground operations. Djibouti, Eritrea, and Somalia opened their airspace, territorial waters, and military bases to coalition forces. At varying stages, the intervention was backed by the United States, United Kingdom, France, Germany, and Canada. The U.S. provided intelligence and logistical support, such as aerial refueling and search-and-rescue for downed coalition pilots, accelerated the sale of weapons to coalition states, and continued strikes against AQAP. American and British servicemen have provided advice and training related to Saudi-led airstrikes in Yemen.
The intervention has drawn criticism from international organizations and human rights groups, which stated that it contributed to civilian casualties, damage to infrastructure, and the humanitarian situation in Yemen. Academics also debate whether it violates Article 2(4) of the UN Charter. By 2019, the conflict was reported as a "military stalemate", and the following year, Saudi Arabia declared its first unilateral ceasefire. On 29 March 2022, the Saudi-led coalition announced that it would cease all hostilities within Yemen to facilitate political talks and peacekeeping efforts; Houthi and Saudi officials subsequently began bilateral peace talks mediated by Oman under UN auspices, and most restrictions on commercial goods were lifted by April 2023. As of April 2024, open hostilities have largely ceased, though negotiations are ongoing due to complications caused by Houthi attacks on Red Sea shipping since October 2023. After Saudi Arabia resumed bombing Yemen amidst the 2026 Iran war, Houthis launched an offensive and succeeded in capturing territory along Yemen's western coast, potentially giving the group control over the geostrategically important Bab-el-Mandeb strait.
Background
Saudi-backed Abdrabbuh Mansur Hadi, running unopposed as the only candidate for president, won the 2012 Yemeni elections. Since August 2014, the Houthis (also known as Ansar Allah) a Zaidi Shia movement and militant group backed by Iran, organized mass protests against the Hadi government's decisions and the new constitution. The protests culminated into the Houthi takeover of the Yemeni government in 2015, after which the Houthis declared victory for the revolution and began drafting a new constitution, saying that Hadi's provisional government's term had already expired. Saudi Arabia and other countries denounced this as an unconstitutional coup d'état. The Houthis were supported by sections of the Yemeni armed forces loyal to the former president Ali Abdullah Saleh, who was removed from power as part of the 2011 Arab Spring uprisings but was later killed by his former Houthi allies.
By September 2014, Houthi fighters captured Sanaa, toppling Hadi's government. Soon after, a peace deal (known as the 'Peace and Partnership Agreement') was sealed between the Hadi government and the Houthis, but was not honored by either party. The deal was drafted with the intent of defining a power-sharing government. A conflict over a draft constitution resulted in the Houthis consolidating control over the Yemeni capital in January 2015. After resigning from his post alongside his prime minister and remaining under virtual house arrest for one month, Hadi fled to Aden in southern Yemen in February. Upon arriving in Aden, Hadi withdrew his resignation, saying that the actions of the Houthis from September 2014 had amounted to a "coup" against him. By 25 March, forces answering to Sanaa were rapidly closing in on Aden, which Hadi had declared to be Yemen's temporary capital.
During the Houthis' southern offensive, Saudi Arabia began a military buildup on its border with Yemen. In response, a Houthi commander boasted that his troops would counterattack against any Saudi aggression and would not stop until they had taken Riyadh, the Saudi capital.
On 25 March, Hadi called on the UN Security Council to authorise "willing countries that wish to help Yemen to provide immediate support for the legitimate authority by all means and measures to protect Yemen and deter the Houthi aggression".
Yemen's foreign minister, Riad Yassin, requested military assistance from the Arab League on 25 March, amid reports that Hadi had fled his provisional capital. On 26 March, Saudi state TV station Al-Ekhbariya TV reported that Hadi arrived at a Riyadh airbase and was met by Saudi defense minister Mohammed bin Salman. His route from Aden to Riyadh was not immediately known.
At a summit of the Arab League held in Sharm El-Sheikh, Egypt, on 28–29 March, President Hadi again repeated his calls for international intervention in the fighting. A number of League members pledged their support to Hadi's government during that meeting.
After more than seven years of hostilities that left thousands of civilians dead or injured and devastated Yemen, a surprise deal was agreed between regional rivals Saudi Arabia and Iran in March 2023. The deal aimed to restore diplomatic relations that could end the Saudi war in Yemen. Experts raised a warning that the war could worsen instead of ending, if Saudi Arabia agrees to end military operations.
Operation Decisive Storm
According to the Saudi news outlet Al Arabiya, Saudi Arabia contributed 100 warplanes and 150,000 soldiers to the military operation. Several media agencies reported that planes from Egypt, Morocco, Jordan, Sudan, Kuwait, the United Arab Emirates, Qatar and Bahrain were taking part. Egypt had previously sent four warships supporting the Saudi naval blockade.
The operation was declared over on 21 April 2015.
Air campaign
March 2015
In March 2015, in a joint statement, the member states of the Gulf Cooperation Council (with the exception of Oman) said they had decided to intervene against the Houthis at the request of Hadi's government.
The coalition declared Yemeni airspace to be a restricted area, with King Salman declaring the Royal Saudi Air Force to be in full control of the zone. Saudi Arabia began airstrikes, reportedly relying on US intelligence reports and surveillance images to select and hit targets, including weapons, aircraft on the ground and air defences. Al Jazeera reported that Mohammed Ali al-Houthi, a Houthi commander appointed in February as president of the Revolutionary Committee, was injured and three other Houthi commanders were killed by airstrikes in Sanaa.
Strikes on 26 March also hit Al Anad Air Base, a former US special operations forces facility in Lahij Governorate seized by Houthis earlier in the week. The targets reportedly included the Houthi-controlled missile base in Sanaa and its fuel depot. Strikes overnight also targeted Houthis in Taiz and Saada. Thousands demonstrated in Sanaa against the intervention, which ex-president Ali Abdullah Saleh also condemned. In Taiz thousands came out supporting Hadi and Saudi Arabia.
The scope of strikes expanded further on 27 March, with a radar installation in the Marib Governorate and an airbase in the Abyan Governorate coming under air attack. The commander of the operation dismissed reports of civilian casualties, saying airstrikes were being carried out with precision. Additional strikes early on the next day hit targets in Hodeidah, Saada and the Sanaa area, as well as Ali Abdullah Saleh's main base. Rumours indicated Saleh fled to Sanhan, on the outskirts of the Houthi-controlled capital. An Aden government official said Saudi strikes destroyed a long-range missile facility controlled by the Houthis.
The Houthis claimed to have shot down a Sudanese Air Force plane over northern Sanaa and captured its pilot on 28 March. The Sudanese government denied that any of its four warplanes had come under fire or been shot down. On the previous day, the Houthis claimed to have shot down a "hostile" Saudi drone in Sanaa.
Airstrikes hit an arms depot, military airbase and special forces headquarters in Sanaa early on 29 March. A weapons depot outside Sanaa was destroyed, causing damage to an airport and planes on the ground. Saada and Hodeidah were targeted as well. Brigadier General Ahmed Asiri, the coalition's spokesman, said Saudi artillery and Apache attack helicopters were mobilised to "deter" Houthi fighters massing on the border with Saudi Arabia.
On 30 March, at least 40 people including children were killed and 200 were injured by an airstrike that hit the Al-Mazraq refugee camp near a military installation in the northern district of Haradh, international organizations said. Airstrikes also hit areas near the presidential palace in Sanaa, as well as Aden International Airport.
Food storage of Yemen Economic Corporation in Hodeidah was destroyed by three coalition strikes on 31 March. Airstrikes were not limited to the Yemeni mainland. Missiles struck homes on the island of Perim, according to residents who fled by boat to Djibouti.
April 2015
Dozens of casualties came from an explosion in a dairy and oil factory in Hodeidah, which was variously blamed on an airstrike or a rocket from a nearby military base on 1 April. Medical sources reported 25 deaths, while the Yemen Army said 37 were killed and 80 wounded. Airstrikes also hit targets in Saada on 1 April.
Despite persistent airstrikes, Houthi and allied units continued to advance on central Aden, backed by tanks and heavy artillery. Houthis seized the presidential palace on 2 April, but reportedly withdrew after overnight air raids early the next day. Coalition planes also airdropped weapons and medical aid to pro-Hadi fighters in Aden.
The International Committee of the Red Cross (ICRC) announced on 5 April that it had received permission from the coalition to fly medical supplies and aid workers into Sanaa and was awaiting permission to send a surgical team by boat to Aden. The coalition said it had set up a special body to coordinate aid deliveries to Yemen.
On 6 April, airstrikes began before sunset and struck targets in western Sanaa, Saada and the Ad Dali' Governorate, a supply route for Houthis in the Battle of Aden.
Airstrikes on 7 April hit a Republican Guard base in the Ibb Governorate, injuring 25 troops. Yemeni sources claimed three children at a nearby school were killed by the attack, while six were injured.
The Parliament of Pakistan voted against military action on 10 April, despite a request from Saudi Arabia that it join the coalition.
Airstrikes launched on 12 April, against the base of the 22nd Brigade of the Yemeni Republican Guard in the Taiz Governorate struck both the brigade and a nearby village inhabited by members of the Al-Akhdam minority community, killing eight civilians and injuring more than ten others. On 17 April, both the GCC coalition's spokesman called by Saudi broadcaster Al-Ehkbariya TV and a commander of the pro-Hadi rebels on the ground said airstrikes had intensified, focusing on both Sanaa and Taiz. One strike on the Republican Palace in Taiz killed 19 pro-Houthi gunmen.
Naval role
Egypt and Saudi Arabia committed warships to support coalition operations. Somalia offered its airspace and territorial waters. Four Egyptian Navy vessels steamed toward the Gulf of Aden after operations began. Riyadh requested access to Somali airspace and waters to carry out operations. On 27 March, the Egyptian military said a squadron of Egyptian and Saudi warships took up positions at the Bab al-Mandab strait. The Saudi military threatened to destroy any ship attempting to make port.
The Royal Saudi Navy evacuated diplomats and United Nations staff from Aden to Jeddah on 28 March.
Witnesses told Reuters that Egyptian warships bombarded Houthi positions as they attempted to advance on Aden on 30 March. Warships again fired on Houthi positions at Aden International Airport on or about 1 April.
Djibouti foreign minister Mahmoud Ali Youssouf said the Houthis placed heavy weapons and fast attack boats on Perim and a smaller island in the Bab al-Mandab strait. He warned "the prospect of a war in the strait of Bab al-Mandab is a real one" and said the weapons posed "a big danger" to his country, commercial shipping traffic, and military vessels. He called on the coalition to clear the islands, which he said included missiles and long-range cannons.
On 4 April, Egyptian President Abdel Fattah el-Sisi called protecting Red Sea shipping and securing the Bab al-Mandab "a top priority for Egypt's national security".
On 15 April, coalition spokesman Saudi Brigadier General Ahmed Al-Asiri, said that its warships were focusing on protecting shipping routes and screening ships heading to port for shipments intended for the Houthis.
The US Navy provided support to the naval blockade, halting and searching vessels suspected of carrying Iranian arms to the Houthis. On 21 April, the United States announced it was deploying warships to Yemeni waters to monitor Iranian ships. The US in particular noted a convoy of Iranian vessels, which US authorities said could potentially be carrying weapons to Houthi fighters in contravention of UN sanctions. The US reported that the Iranian convoy reversed course on 23 April.
Ground clashes
Sudan said it was stationing ground troops in Saudi Arabia. The Special Forces of the Bahrain Defence Force, Taskforce 11, were also deployed to Yemen.
Between 31 March and April, Saudi and Houthi forces reportedly traded artillery and rocket fire across the border between SA and Yemen. A Saudi border guard was killed on 2 April, the campaign's first confirmed coalition casualty. Followed by another two soldiers killed the next day. An Egyptian truck driver was killed by Houthi shelling.
SA reportedly began removing sections of the Saudi–Yemen barrier fence along its border with the Saada and Hajjah governorates on 3 April. The purpose of the removal was not immediately clear.