Below 8,000 m (26,247 ft), however, the Sabre had a slight advantage over the MiG in most aspects excluding climb rate, especially if the Soviet pilot made the mistake of fighting in the horizontal plane. The main mission of the MiG-15 was not to dogfight the F-86, but to counter the USAF Boeing B-29 Superfortress bombers. This mission was assigned to the elite of the Soviet Air Force (VVS), in April 1951 to the 324th IAD of Colonel Ivan Kozhedub, and later to the 303rd IAD of General Georgiy A. Lobov, who arrived to Korea in June of the same year. A total of 44 MiG-15s achieved victories in that mission on 12 April 1951 when they intercepted a large formation of 48 B-29 Superfortresses, 18 F-86 Sabres, 54 F-84 Thunderjets and 24 F-80 Shooting Stars heading towards the bridge linking North Korea and Red China over the Yalu river in Uiju. When the ensuing battle was finished, the experienced Soviet fliers had shot down or damaged beyond repair 10 B-29As, one F-86A and three F-80Cs for the loss of only one MiG. U.S. strategic bombers returned the week of 22–27 October to neutralize the North Korean aerodromes of Namsi, Taechon and Saamchan, taking further losses to the MiG-15. On 23 October 1951, 56 MiG-15bis intercepted nine B-29s escorted by 34 F-86s and 55 F-84Es. In spite of their numerical inferiority, the Soviet airmen shot down or damaged beyond repair eight B-29As and two F-84Es, losing only one MiG in return and leading Americans to call that day "Black Tuesday". The most successful Soviet pilots that day were Lieutenant Colonel Aleksandr P. Smorchkov and 1st Lieutenant Dmitriy A. Samoylov. The former shot down a Superfortress on each of 22, 23 and 24 October. Samoylov added two F-86As to his tally on 24 October 1951, and on 27 October shot down two more aircraft: a B-29A and an F-84E. These losses among the heavy bombers forced the Far East Air Forces High Command to cancel the precision daylight attacks of the B-29s and only undertake radar-directed night raids. From November 1951 to January 1952, both sides tried to achieve air superiority over the Yalu, or at least tried to deny it to the enemy, and in consequence, the intensity of the aerial combat reached peaks not seen before between MiG-15 and F-86 pilots.