Carpet bombing
The remaining bombers, minus one more that turned back for mechanical problems, continued toward the target. Twenty-seven Stratofortresses dropped on a one-mile by two-mile target box from between 19,000 and 22,000 feet (5,800 and 6,700 m), a little more than 50% of the bombs falling within the target zone. The force returned to Andersen AFB except for one bomber with electrical problems that recovered to Clark AFB, the mission having lasted 13 hours. Post-strike assessment by teams of South Vietnamese troops with American advisors found evidence that the VC had departed the area before the raid, and it was suspected that infiltration of the south's forces may have tipped off the north because of the ARVN troops involved in the post-strike inspection.

Beginning in late 1965, a number of B-52Ds underwent Big Belly modifications to increase bomb capacity for carpet bombings. While the external payload remained at twenty-four 500-pound (227 kg) or 750-pound (340 kg) bombs, the internal capacity increased from twenty-seven to eighty-four 500-pound bombs or from twenty-seven to forty-two 750-pound bombs. The modification created enough capacity for a total of 60,000 pounds (27,215 kg) in one hundred and eight bombs. Thus modified, B-52Ds could carry 22,000 pounds (9,980 kg) more than B-52Fs. Designed to replace B-52Fs, modified B-52Ds entered combat in April 1966 flying from Andersen Air Force Base, Guam. Each bombing mission lasted 10 to 12 hours with an aerial refueling by KC-135 Stratotankers. In spring 1967, the aircraft began flying from U Tapao Airfield in Thailand giving the aircraft the advantage of not requiring in-flight refueling.
The zenith of B-52 attacks in Vietnam was Operation Linebacker II (sometimes referred to as the Christmas Bombing) which consisted of waves of B-52s (mostly D models, but some Gs without jamming equipment and with a smaller bomb load). Over 12 days, B-52s flew 729 sorties and dropped 15,237 tons of bombs on Hanoi, Haiphong, and other targets. Originally 42 B-52s were committed to the war; however, numbers were frequently twice this figure.

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References: 

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Knaack, Marcelle Size (1988). Post-World War II Bombers, 1945–1973 (PDF). Washington, D.C.: Office of Air Force History. ISBN 978-0-16-002260-9.
Lake, Jon; Styling, Mark (2004). B-52 Stratofortress Units in Combat 1955–73. London: Osprey Publishing. ISBN 978-1-84176-607-2.
Overy, Richard (2013). The Bombing War, Europe 1939-45 (Kindle, 2014 ed.). London: Penguin Books Ltd. ISBN 978-0-141-92782-4.
Schlight, John (1988). The War in South Vietnam: The Years of the Offensive, 1965–1968 (The United States Air Force in Southeast Asia). Washington, D.C.: Office of Air Force History, United States Air Force. ISBN 978-0-912799-51-3.

External links: "Bombs Over Cambodia" from The Walrus