August 1942 the 747th DBAP had only ten Yer-2s on hand and it was briefly committed during the Battle of Stalingrad. The survivors were flown, in ever dwindling numbers, until August 1943 when the last few aircraft were transferred to schools by the 2nd Guards DBAP and the 747th DBAP. The Yer-2 was placed back into production at the end of 1943, but none of the new bombers had been issued to combat units by 1 June 1944. However 42 were in service on 1 January 1945 and 101 on 10 May 1945 after the war ended. The first combat mission undertaken by Yer-2s after they returned to production was a raid on Königsberg on 7 April 1945 by the 327th and 329th Bomber Aviation Regiments (). It remained in service with Long-Range Aviation units until replaced by four-engined bombers like the Tupolev Tu-4 in the late 1940s. Variants DB-240 Two prototypes of the Yer-2 series with two 1,050 hp M-105 engines. Yer-2 Production version with two M-105 engines, 128 built. Yer-2/AM-37 One aircraft re-engined with two prototype 1,380 hp Mikulin AM-37 engines, the fastest of all Yer-2s. Yer-2/M-40F The first diesel-powered Yer-2, with modified wings. One converted with two 1,500 hp Charomskiy M-40F diesel engines. Yer-2/ACh-30B Production model of the diesel-engined version. Performance was excellent despite the poor reliability and rough running of the Charomskiy ACh-30B diesel engines. Range increased from the version with M-105 engines. Yer-2ON (−Special Assignment) Two aircraft from the Yer-2/ACh-30B production line were modified with a 12-seat VIP cabin, military equipment removed and long-range fuel tanks in the bomb-bay. A third aircraft was converted from a Yer-2 (1941 production) and used for shuttle flights between Irkutsk and Moscow. Yer-2N (−Carrier) One aircraft was modified as an engine testbed for captured Argus As 014 pulse jet engines. Yer-2/MB-100 One production aircraft used as a testbed for the Dobrotvorskii MB-100 engine in 1945. Yer-4 The final iteration of the Yer-2 series was a 1941 production aircraft re-engined with ACh-30BF engines and redesignated as the Yer-4. It had a slightly larger wingspan, increased takeoff weight and improved armament. The prototype was tested in December 1943, but did not enter production. Operators VVS (—Soviet Air Forces) ADD (—Long Range Aviation) 420th Long-Range Bomber Aviation Regiment, later the 748th Long-Range Bomber Aviation Regiment 421st Long-Range Bomber Aviation Regiment, later the 747th Long-Range Bomber Aviation Regiment 747th Long-Range Bomber Aviation Regiment