By Dr Jacob Stoil

Starting on 19 October 2023, the Houthi attacks against international shipping and Israel have seen many air power firsts. In their very first attack, the Iranian-backed Houthis employed attack drones against maritime targets, which eventually led to the first instance of the German Navy shooting down enemy aviation since the Second World War. Even more significantly, Houthi ballistic missile attacks against Israel led to the first combat interception in space. However, as much as things have changed, the strategic problem the Houthis present and the air-centric means that the US has chosen to oppose it, has a long history in the Middle East and raises questions about the strategic limitations of air power.

The Houthis sit aside a strategically critical sea line of communication (SLOC). In peacetime, between 10-15% of global trade and around 30% of global container traffic flow through the Suez Canal and into the Houthi crosshairs. Should a great power war occur, the significance of the waters of Yemen will only increase. The SLOC through the Red Sea represents the fastest way to move resources at scale from Europe to a Pacific theatre of operations and an essential alternative to the Panama Canal for transiting from the eastern seaboard of the United States to the Indian Ocean and Southwestern Pacific. These two factors mean that the US can little afford the Houthis and their Iranian backers to maintain their at-will blockade of these critical waterways. This same logic led the British Empire to take and hold Aden and launch military campaigns in the Horn of Africa throughout the 19^th and 20^th centuries. Since the US is focusing its combat power on the Pacific and the European powers are most concerned with the threat to their borders, neither is looking for another long-term Middle Eastern entanglement, and so this is an unlikely approach. Instead, the Western allies have turned to an approach with a long history in the Middle East whenever an economy of force is desired – air power.

While by virtue of its strategic position and resources, the Middle East as a region is of critical importance to any modern state wishing to project power globally, most of its territory is not. Occupation is expensive and manpower intensive, and so since the 1920s, powers have attempted to ensure the security of their vital interests by following the mirage of strategic air power. In the Middle East, the basic idea has remained remarkably consistent. The strategic concept is that with air power, a country can conduct scalable punitive raids, which will either erode capability so a potential adversary cannot mount a significant threat, create deterrence by demonstrating the cost of threatening a strategically vital area, or finally weaken an adversary to the point a local rival can unseat them. In theory, this use of air power, a cross-domain version of the punitive expedition, allows countries to achieve and sustain their strategic objectives while not having to involve themselves in the costly and manpower-intensive business of occupying the hinterlands of the Middle East. The current US operations in Yemen appear to be the latest in this long history.

For decades, Israel pursued a similar policy known as ‘mowing the grass.’ In this mode of operation, whenever militant groups or adversaries escalated beyond a certain threshold, Israel would respond with an air campaign (supported at times by special operations and even limited ground forces). The purpose of these operations was to buy quiet. They did not attempt to change the fundamental dynamic that led to the escalation; instead, they tried to degrade enemy capabilities until the enemy (at least temporarily) no longer posed a credible threat and deter certain forms of future enemy operations. The air campaigns reduced the capabilities of Israel’s enemies. They forced them to spend resources on reconstitution. However, as is now abundantly clear, this did not stop Israel’s enemies from developing the capability to inflict significant harm, nor did it do anything to remove the motivation.

From their initial conception, these air-centric ‘mowing the grass’ operations acknowledged they could not achieve decisive results or a permanent effect. The strategic conditions meant it would always be worth it for the enemy to rebuild and try again. The damage might have been severe, but if it was in Iran’s interest to rebuild its capabilities, then the targeted groups like Hamas and Hezbollah would always be able to rebuild. Without large-scale ground operations and potentially long-term occupation, air power could only achieve a limited strategic effect within the larger geopolitical pressures shaping the Middle East.

The Houthis potentially find themselves in a similar situation to Hamas and Hezbollah facing the Israeli Air Force, which highlights one of the strategic limitations of air-centric campaigning. Turning maritime traffic away from the Red Sea SLOC requires minimal capability. If the Houthis present a credible threat and continue to target vessels, the maritime insurance market will keep many merchant vessels away. This lowers the level of capabilities to which the Houthis must rebuild to interdict the SLOC, as they only need enough to make maritime insurers nervous. The Houthis have also demonstrated to countries like China and Iran, who have been backing them, that they present a relatively low-cost option to complicating US global sealift – even during a time of war. Should the Houthis attack shipping during wartime, they would force the US either to divert precious naval and air power to tackle the challenge or slow global movement by avoiding the contested waters off Yemen. While devastating to the Houthis, the current air campaign is doing little to change either of these two realities. The Houthis’ strategic position is too important to their backers, the cost of closing the straits too low, and the ideology of the Houthis too absolute to be dissuaded by even the most effective air campaign alone.

There has been one recent exception to this pattern, which may provide a way forward for the US air campaign in Yemen. Since 7 October 2023, Israel launched an air campaign against the Assad government in Syria. The purpose of the campaign was not to remove Assad but to diminish the immediate risk Assad posed to Israel. Eventually, Israel added a covert operations campaign and ground offensive against Hezbollah, on whom Assad relied to keep his government in power. Taken together, this weakened the Syrian regime to the point that local Turkish-backed adversaries could overthrow it. Likewise, the Houthis have several regional enemies waiting in Yemen. The Houthis and their backers have managed to hold these enemies at bay. However, the severity of the US air campaign is such that it may hit a tipping point at which point the UAE and Saudi-backed forces in Yemen may take the opportunity to launch a ground offensive. If so, like Syria, it may be counted as a rare win for the strategic employment of air power in the Middle East, but only inasmuch as other forces on the ground are prepared to fight. If not, Yemen will prove a lesson that the Middle East has taught repeatedly – air power is useful, but by itself cannot change the strategic dynamics of the region.

Dr Jacob Stoil is a military historian who is the Research Professor of Middle East Security at the US Army Strategic Studies Institute, Chair of Applied History at the Modern War Institute, Senior Fellow of the 40^th Infantry Urban Warfare Center, and Trustee of the U.S. Commission on Military History. He has worked extensively in the Middle East, including in support of Task Force Spartan. He has published multiple policy and academic articles, which can be found in publications such as the International Journal of Military History, Wavell Room, and Modern War Institute. He can be followed on X as @JacobStoil. 

Header image: A US Navy F/A-18 fighter jet taking off at night before the 2024 Yemeni airstrikes, 12 January 2024. (Source: Wikimedia)