At Easter 1972, North Vietnam invaded the South, and there were almost no US ground troops left to stop it. But air power reinforcements could be rushed to the theater. Operation Linebacker's objective was to destroy the invading forces from the air and cut North Vietnam's supply routes – and luckily in 1972, American air power was beginning a revolution in both technology and tactics.

Most crucial was the introduction of the first effective laser-guided bombs, but the campaign also involved the fearsome AC-130 gunship and saw the debut of helicopter-mounted TOW missiles. Thanks to the new Top Gun fighter school, US naval aviators now also had a real advantage over the MiGs.

This is the fascinating story of arguably the world's first “modern” air campaign. It explains how this complex operation – involving tactical aircraft, strategic bombers, close air support and airlift – defeated the invasion. It also explains the shortcomings of the campaign, the contrasting approaches of the USAF and Navy, and the impact that Linebacker had on modern air warfare.

In 1943, the USAAF and RAF launched the Combined Bomber Offensive, designed to systematically destroy the industries that the German war machine relied on. At the top of the hit list were aircraft factories and plants making ball-bearings - a component thought to be a critical vulnerability. Schweinfurt in southern Germany was home to much of the ball-bearing industry and, together with the Messerschmitt factory in Regensburg, which built Bf 109 fighters, it was targeted in a huge and innovative strike. Precision required that the targets were hit in daylight, but the raid was beyond the range of any existing escort fighter, so the B-17s would go in unprotected. The solution was to hit the two targets in a coordinated 'double-strike', with the Regensburg strike hitting first, drawing off the defending Luftwaffe fighters, and leaving the way clear for the Schweinfurt bombers. The Regensburg force would carry on over the Alps to North Africa, the first example of US 'shuttle bombing'. Although the attack on Regensburg was successful, the damage to Schweinfurt only temporarily stalled production, and the Eighth Air Force had suffered heavy losses. It would take a sustained campaign, not just a single raid, to cripple the Schweinfurt works. However, when a follow-up raid was finally launched two months later, the losses sustained were even greater. This title explains how the USAAF launched its daylight bombing campaign in 1943, the technology and tactics available for the Schweinfurt-Regensburg missions, and how these costly failures forced a change of tack.

After the failed April 1972 invasion of South Vietnam and the heavy US tactical bombing raids in the Hanoi area, the North Vietnamese agreed to return to the Paris peace talks, yet very quickly these negotiations stalled.

In an attempt to end the war quickly and 'persuade' the North Vietnamese to return to the negotiating table, President Nixon ordered the Air Force to send the US' ultimate conventional weapon, the B-52 bomber, against their capital, Hanoi. Bristling with the latest Soviet air defence missiles, it was the most heavily defended target in Vietnam. Taking place in late December, this campaign was soon dubbed the 'Christmas Bombings'.

Using specially commissioned artwork and maps, ex-USAF fighter colonel Marshall Michel describes Linebacker II, the climax of the air war over Vietnam, and history's only example of how America's best Cold War bombers performed against contemporary Soviet air defences.