Further narrative from the same source
In October 1942, Hartmann was assigned to fighter wing Jagdgeschwader 52 (JG 52), based at Maykop on the Eastern Front in the Soviet Union. The wing was equipped with the Messerschmitt Bf 109G, but Hartmann and several other pilots were initially given the task of ferrying Junkers Ju 87 Stukas down to Mariupol. His first flight ended with brake failure, causing the Stuka to crash into and destroy the controller's hut. Hartmann was assigned to III./JG 52, led by Gruppenkommandeur Major Hubertus von Bonin, and placed under the experienced Oberfeldwebel Edmund "Paule" Roßmann, although he also flew with such experienced pilots as Alfred Grislawski, Hans Dammers and Josef Zwernemann. After a few days of intensive mock combats and practice flights, Grislawski conceded that, although Hartmann had much to learn regarding combat tactics, he was quite a talented pilot. Paule Roßmann taught Hartmann the fundamentals of the surprise attack, a tactic that led to his "See – Decide – Attack – Break" style of aerial combat.
Hartmann flew his first combat mission on 14 October 1942 as Roßmann's wingman. When they encountered 10 enemy aircraft below, Hartmann, obsessed by the idea of scoring his first kill, opened full throttle and became separated from Roßmann. He engaged an enemy fighter, but failed to score any hits and nearly collided with it instead. He then ran for cover in low cloud, and his mission subsequently ended with a crash landing after his aircraft ran out of fuel. Hartmann had violated almost every rule of air-to-air combat, and von Bonin sentenced him to three days of working with the ground crew. Twenty-two days later, Hartmann claimed his first kill, an Ilyushin Il-2 of the 7th Guards Ground Attack Aviation Regiment, but, by the end of 1942, he had added only one more kill to his tally. As with many top aces, it took him some time to establish himself as a consistently scoring fighter pilot.
Hartmann's youthful appearance earned him the nickname "Bubi" (the hypocoristic form of "young boy" in the German language), and the ace Walter Krupinski, to whom Hartmann was assigned as wingman, would constantly urge him: "Hey, Bubi, get in closer". On 25 May 1943, he shot down a LaGG-5 before colliding with another Soviet fighter but was able to maintain control of his damaged aircraft. On 7 July, in the large dogfights that occurred during the Battle of Kursk, he shot down seven enemy aircraft. At the start of August 1943, his tally stood at 50, and, by the end of the month, he had added another 48 kills. In the following month, he was appointed Staffelkapitän of 9./JG 52.
In his first year of operational service, Hartmann felt a distinct lack of respect towards Russian pilots. He recalled that most Soviet fighters did not have proper gunsights, and their pilots resorted to drawing them on the windshield by hand.
In the early days, incredible as it may seem, there was no reason for you to feel fear if the Russian fighter was behind you. With their hand-painted "gunsights" they couldn't pull the lead properly or hit you.
While Hartmann considered the P-39, P-40, and Hurricane inferior to the Fw 190 and Bf 109, they did provide the Soviets with valuable gunsight technology.
The Germans learned a few tricks from their enemy. Oil freezing in the DB 605 engines of their Bf 109G-6s made them difficult to start in the extreme cold of the Russian winter. A captured Soviet airman demonstrated how pouring fuel into the aircraft's oil sump would thaw the oil and allow the engine to start after only one attempt. Another solution to this problem, also learned from the Soviets, was to ignite fuel under the engine.