 The most successful role of the Bf 110 during the Battle was as a "fast bomber" ("Schnellbomber"), the same role that the Junkers Ju 88A had been designed for in the mid-1930s.One unit, Test Group 210" ("Erprobungsgruppe 210") — originally meant to service test the Bf 110's intended (but ill-fated) replacement, the Messerschmitt Me 210 — proved it could carry a greater bomb load over a greater range than a Ju 87 and deliver it with similar accuracy, while its much higher maximum speed, especially at lower altitudes, meant it was far more capable of evading RAF fighters.The Bf 110 possessed a heavy armament of two 20 mm MG FF/M cannon and four 7.92 mm MG 17s concentrated in the forward fuselage, along with a single 7.92 mm MG 15 for rear defence in the rear cockpit.