I always saw the P-61 Blackwidow as a night bomber...It's intresting you say it is a night fighter, did it have the manouvrability of a fighter or did it relly on the cover of darkness to engage it's victims... I know that it was one of the first planes to have an onboard radar which could have made it an effective night fighter but also a bomber... As a fighter it's strong point would have been the crew number(I'm guessing 5, this meaning 5 pears of trained eyes), giving it an advantage in spotting the enemy... My respect to the Widow...