Yesterday I peppered a Focke-Wulf with my machine guns for about a minute, resulting in no visible damage.  But then another P-38 zoomed down and hit the FW-190 with cannon, turning the Kraut into a wingless ball of fire.  It gave me the kill.  I was suprised; although I felt I deserved the kill, as I had initially outmaneuvered the foe and had gotten a lot more hits than the other 38, he was the one who actually made the airplane go down.