Allied Bristol Blenheim
In the battle of Britain, the RAF converted twin-engined bombers like the "Bristol Blenheim" into a nightfighter. This was done by installing offensive ordance and radar. Those had very little success because they were not any faster than their prey. Messerschmitts Me 110 wich was a disasterous fail. As a two-engined two seated day fighter,it was very successful at night-fighting along with other similarly modified Ju 88 bombers.