using onboard radar to guide them to a visual interception, when their AI night fighter brought down a Do 17 off Sussex. On 19 November 1940 the famous RAF night fighter ace John Cunningham shot down a Ju 88 bomber using airborne radar, just as Dowding had predicted. By mid-November, nine squadrons were available, but only one was equipped with Beaufighters (No. 219 Squadron RAF at RAF Kenley). By 16 February 1941, this had grown to 12; with 5 equipped, or partially equipped with Beaufighters spread over 5 Groups. Second phase Night attacks From November 1940 to February 1941, the Luftwaffe shifted its strategy and attacked other industrial cities. In particular, the West Midlands were targeted. On the night of 13/14 November, 77 He 111s of Kampfgeschwader 26 (26th Bomber Wing, or KG 26) bombed London while 63 from KG 55 hit Birmingham. The next night, a large force hit Coventry. "Pathfinders" from 12 Kampfgruppe 100 (Bomb Group 100 or KGr 100) led 437 bombers from KG 1, KG 3, KG 26, KG 27, KG 55 and Lehrgeschwader 1 (1st Training Wing, or LG 1) which dropped of high explosive, of incendiaries, and 127 parachute mines. Other sources say 449 bombers and a total of of bombs were dropped. The raid against Coventry was particularly devastating, and led to widespread use of the phrase "to coventrate". Over 10,000 incendiaries were dropped. Around 21 factories were seriously damaged in Coventry, and loss of public utilities stopped work at nine others, disrupting industrial output for several months. Only one bomber was lost, to anti-aircraft fire, despite the RAF flying 125-night sorties. No follow-up raids were made, as OKL underestimated the British power of recovery (as Bomber Command would do over Germany from 1943 to 1945). The Germans were surprised by the success of the attack. The strategic effect of the raid was a brief 20 percent dip in aircraft production. Five nights later, Birmingham was hit by 369 bombers from KG 54, KG 26, and KG 55. By the end of November, 1,100 bombers were available for night raids. An average of 200 were able to strike per night. This weight of attack went on for two months, with the Luftwaffe dropping of bombs. In November 1940, 6,000 sorties and 23 major attacks (more than 100 tons [] of bombs dropped) were flown. Two heavy ( of bombs) attacks were also flown.