RAF vs. Usaaf: The Bombing Doctrine Split That Divided the Allies

RAF vs USAAF: The Bombing Doctrine Split That Divided the Allies - WarCommons Home » Latest articles » RAF vs USAAF: The Bombing Doctrine Split That Divided the Allies RAF vs USAAF: The Bombing Doctrine Split That Divided the Allies by Nick Ravenshade March 11, 2026 March 12, 2026 WarCommons Now Table of Contents Toggle Two Allies, two doctrines, one common goal: ensuring the downfall of Nazi Germany from the air. But can the Allies achieve their goal when they both have their own fundamental beliefs about their enduringly different doctrines? The key players were clearly the Americans, with their United States Army Air Forces (USAAF), and the British, with their Royal Air Force (RAF). Although the Americans and British were certainly allies, their strategic bombing methods proved anything but close cooperation. Two doctrines over Germany The two doctrines that played a key role in Germany’s strategic bombing campaign were the RAF’s area bombing and the USAAF’s precision bombing. The RAF bombed Germany primarily at night. The USAAF operated primarily during the day with its precision bombing. The RAF doctrine The RAF began its bombing campaigns during the Second World War primarily during the day, applying the doctrine of area bombing. Due to heavy losses at the beginning of the war, the RAF switched to nighttime raids on cities. The initial decision to bomb during the day was primarily based on precision. The RAF concluded that visibility during the day was significantly better than at night, allowing bombers to hit specific military or industrial targets (such as factories, railways, and airfields) much more accurately than at night. Therefore, the RAF did use precision bombing during the day at the beginning of the war. But this choice wasn’t entirely voluntary either. In the early stages of the war, the RAF’s navigation systems weren’t sufficiently developed to effectively locate targets in German (occupied) territory at night. A major part of the strategy was to weaken the German war machine by using targeted attacks, something that was more effective during the day. However, the RAF soon encountered a major problem. The daytime bombing resulted in enormous losses to their aircraft and crews. This was partly made possible by the Luftwaffe, with its fighter planes, which could operate extremely efficiently in daylight. What also became clear over time was that the precision bombing they were still conducting during daylight hours proved to be too inaccurate. Therefore, the RAF Bomber Command switched to night bombing, using the cover of darkness to their advantage. The switch to night bombing also brought about a shift in doctrine. Instead of precision bombing during the day, the RAF switched to area bombing at night. This also changed the objective of the bombing campaign: to break the morale of the German population and destroy industrial centers. The USAAF doctrine Like the RAF, the USAAF also began with daytime bombing at the start of the war. However, unlike the RAF, the USAAF continued this practice throughout the Second World War. The USAAF also suffered significant losses during daytime. This forced the USAAF to scale back its precision bombing efforts. However, they maintained their doctrine of daytime precision bombing and did not abandon it for area bombing, as the RAF did. The USAAF, however, did refine its doctrine. The USAAF, too, was suffering heavy losses because it carried out its aerial bombardments during the day. They attempted to mitigate these losses by flying in tight formations at high altitudes during daytime. This would ensure better defense against the German Luftwaffe fighters. The USAAF also believed this would guarantee the accuracy of the bombings. The idea behind flying in tight formations was that the aircraft, with their combined onboard weapons (machine guns), could form a so-called box formation that could effectively defend itself against the Luftwaffe fighters. The goal of the precision bombing raids throughout the day was to destroy specific, high-value industrial targets, such as oil refineries, ball-bearing factories, and aircraft factories, in order to paralyze the German war machine and war economy. Norden bombsight To maintain accuracy from high altitude, the USAAF relied on the Norden bombsight to ensure precision. The importance of the Norden bombsight is still often overlooked. It was a truly fascinating instrument in its day. It’s said that, after the atomic bomb, it was America’s biggest secret of the Second World War. The instrument allowed American bombers to accurately locate their targets from high altitude. Normally, this was very difficult at high altitude due to the influence of the altitude itself, the bomber’s speed, and the wind. The Norden bombsight was a kind of analog computer. It controlled an autopilot. It wasn’t just a sight. Using mirrors, lenses, and cameras, the Norden bombsight determined the target and then released the bomb. It was claimed that, in theory, the bomber could hit its target within a thirty-meter radius from an altitude of seven kilometers. This increased the USAAF’s confidence that they could carry out their precision bombing during the day and also reduce losses by being able to fly at high altitude and still bomb the right targets with precision. The Norden bombsight was top secret. The factories where it was manufactured were heavily guarded. Security measures were also in place during the operational phase. For example, the Norden bombsight was loaded and unloaded under strict surveillance before and after each bomber flight. The crew was also required to swear their lives to prevent the device from falling into enemy hands. Much as the USAAF believed in the Norden bombsight at the time, the effectiveness of the Norden bombsight was later questioned. The Allied bombing split It’s clear that the Americans and British had different doctrines regarding aerial bombardment at the beginning of the Second World War and throughout. But in practice, this also caused friction between the two Allies. One of the most compelling examples of the disagreement and friction can be seen in the priority dispute surrounding Operation Pointblank and the intervention of the Combined Chiefs of Staff in June 1943. The Combined Chiefs of Staff issued the Pointblank directive to resolve competing priorities, such as submarine shipyards, fighter aircraft, production, or oil. This directive itself is evidence of earlier disagreement. It formalized the Allies’ prioritization of objectives and demonstrated that national air forces had to be forced to agree on a common list by the highest political-military level. But this wasn’t the only incident by far. In 1942, the American Eighth Air Force expanded its operations in Great Britain. The Americans insisted that the raids be carried out during the day, in order to bomb specific industrial targets. The RAF itself had other plans. The RAF continued its nighttime area bombing and resisted diverting the mission assigned to it by Bomber Command to the same small, well-defended targets prioritized by the USAAF. The Allies’ disagreement over aerial bombing doctrine wasn’t limited to the operational level. It also manifested itself at the tactical level. The RAF and USAAF also appeared to have disagreements regarding missions supposedly coordinated between the two sides. A practical example is when Bomber Command was asked whether it should focus on area attacks that would assist the USAAF in its daily bombing campaign, or whether the USAAF should perform more diversionary or area-based missions. These disagreements are reflected in operational reports and postwar evaluations, such as the United States Strategic Bombing Survey. The Casablanca Conference was also not entirely straightforward. General Henry H. Arnold was surprised by the RAF delegates at this conference. Arnold asked General Ira C. Eaker for help in convincing Winston Churchill to deploy the RAF for daytime bombing. The outcome, however, was a major fiasco. It resulted in doctrinal disagreements, which were settled by both sides with an agreement to remain in disagreement on doctrine. This agreement is seen as a written confirmation of what the RAF and the USAAF were already trying to pursue separately: separate doctrines and strategies to win the war. Arthur “Bomber” Harris But beyond all this, there was also a man named Arthur “Bomber” Harris. At times, it was Harris versus the rest. He openly and repeatedly resisted pressure to deploy his bombers for precision bombing. Particularly after the bombing of Schweinfurt in 1943, Harris opposed carrying out attacks on specific oil infrastructure and ball-bearing factories, which the Combined Chiefs continued to insist on. He always maintained his own conviction that bombing cities was the correct strategy. He made no secret of this conviction. One of his most notorious remarks is labeling precision bombing as fantasy and so-called panacea thinking. It shows how a British commander dismisses the strategy of its greatest ally, the United States, as naive, instead of advocating for coordination among allies. “I do not believe in ‘panacea’ targets, e.g., oil, rubber, ball bearings. Specializing on one such industry means that the enemy concentrates all his defenses, and nothing else in Germany, including morale and housing, is likely to suffer.” – Harris, April 1943 The USAAF’s aerial bombardments of the ball-bearing factories in Schweinfurt in August and October 1943 provide one of the clearest illustrations of the split between the RAF and the USAAF and their respective doctrines. The USAAF suffered catastrophic losses during the second raid, losing 60 bombers in a single day. This forced the USAAF to halt raids deep inside German territory. Harris witnessed this, and the incident confirmed everything he believed in. The Americans risked lives by carrying out precision bombing during the day, while the British systematically undermined the morale of the German civilian population. Such is the story of two countries, two allies with two fundamental convictions about their upheld doctrines; both believed they were right, and both were convinced the other was wrong. The reality, however, was more complicated. Ultimately, neither was entirely right. The convergence of the doctrines The disagreements and operational and tactical differences, however, didn’t lead to friction throughout the Second World War. From 1943 onward, it became clear that the differences in doctrine didn’t necessarily lead to friction; they actually complemented each other. The two doctrines merged from June 1943 onwards to create a so-called “round-the-clock” strategy. The efforts of both the RAF and the USAAF were then coordinated through the Combined Bomber Offensive (CBO). The RAF carried out area bombing at night, while the USAAF conducted precision bombing during the day. Instead of competing over which doctrine was most effective, they began to complement each other. The RAF was led by Arthur “Bomber” Harris. They carried out large-scale nighttime bombings. Within the CBO, the bombings were aimed at breaking German morale. They therefore focused on destroying city centers and industrial areas. As soon as daylight returned, it was the USAAF’s turn to carry out their precision bombing. The USAAF aimed to destroy specific economic and military targets, such as factories, oil installations, and road junctions. The CBO fine-tuned this joint campaign. It was a practical solution that reconciled the two doctrines. The CBO achieved this by agreeing on joint targeting priorities. The targets to be attacked were determined, along with the timeframe within which they were to be attacked. This ensured that the attacks reinforced each other, rather than undermining each other. Whether one can speak of a true reconciliation between the two doctrines is a matter of debate. The convergence of the two doctrines, the “round-the-clock” strategy, and the coordinated efforts between the RAF and the USAAF were primarily operational and hierarchical. The Combined Chiefs set priorities and allowed the RAF and USAAF to work in a complementary manner, as in Operation Pointblank. And Harris? Harris remained a proponent of area bombing and didn’t fundamentally change his beliefs, but he did accept operational cooperation. WarCommons publishes long-form, source-driven analysis without ads or click incentives. If you found this feature valuable, consider supporting our research by subscribing to help fund future investigations. By Nick Ravenshade — Author Image: CLASSIC precision bombing featured this attack by 100 B-17s on a Focke-Wulf plant at Marienburg on Oct. 9, 1943. Source: Wikimedia Commons . Public domain. 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