In August (Tame Boar) tactics were used to some effect. Viktor von Loßberg's idea was for night fighters equipped with experimental SN-2 radar to cooperate with Y-control systems and "sluice" them into the bomber stream. Once there, the night fighters were ordered to transmit direction-finding signals to attract other night fighters. While semi-unguided, the radar operators and night fighter command retained some control over operations with success in August; amounting to 250 aircraft claimed shot down on all fronts. The success was offset by losses of 40 killed in the night fighter arm, with only 28 replacements in August. 61 twin-engine night fighters were lost during the month, but only 59 were replaced. As one German historian noted, the advent of the frequent Mosquito intruder operations from October "no airfield in Central Germany was safe." NJG 1 were engaged in daylight operations against the USAAF in August. Elements of the wing engaged the Eighth Air Force during the Schweinfurt–Regensburg mission with some success. 15 crews of II./NJG 1 were committed to battle, and they claimed seven B-17 Flying Fortress bombers but suffered damage to all of the Bf 110s sent on the interception. Four Bf 110s were shot down by return fire and an encounter with P-47 Thunderbolts of the US 56th Fighter Group. 21 night fighters were destroyed during this operation alone, removing them from the Peenemünde operation that night. NJG 1 were forced to engage USAAF heavy bombers until the end of January 1944; though IV./NJG 1 flew interceptions on 4 February.