Russian Polikarpov Po-2 Biplane

Came across this while reading about the Korean War.

 It is perhaps the second most produced aircraft, and may be the most produced biplane, in the history of aviation. Some estimates put the number built at more than 40,000 between 1928 and 1953. Correct figures are hard to come by since low-rate production by small repair shops and air clubs continued until 1959. - paraphrased from Wikipedia.

During the Korean War:

Undoubtedly the most effective arm of the NKAF (North Korean Air Force) was the night harrassment units with Po-2 biplanes who kept up night bombing sorties over Korea for the whole war with biplanes and from time to time scored amazingly lucky hits. In fact, those biplanes destroyed more USAF planes on the ground than the entire NKAF destroyed in the air. JCR commenting on Military Photos dot net

More from Wikipedia about the PO-2 in the Korean War:

North Korean forces used the Po-2 in a similar role in the Korean War. A significant number of Po-2s were fielded by the Korean People's Air Force, inflicting serious damage during night raids on Allied bases. On 28 November, at 0300 hours, a lone Po-2 attacked Pyongyang airfield in northwestern Korea. Concentrating on the 8th Fighter-Bomber Group's parking ramp, the Po-2 dropped a string of fragmentation bombs squarely across the Group's lineup of P-51 Mustangs. Eleven Mustangs were damaged, three so badly that they were destroyed when Pyongyang was abandoned several days later.
On 17 June 1951, at 0130 hours, Suwon airfield was bombed by two Po-2s. Each biplane dropped a pair of fragmentation bombs. One scored a hit on the 802nd Engineer Aviation Battalion's motor pool, damaging some equipment. Two bombs burst on the flight line of the 335th Fighter Interceptor Squadron. One F-86A Sabre was struck on the wing and began burning. The fire took hold, gutting the aircraft. Prompt action by personnel who moved aircraft away from the burning Sabre preventing further loss. Yet eight other Sabres had been damaged in the brief attack, four seriously. One F-86 pilot was among the wounded. The North Koreans subsequently credited Lt. La Woon Yung with this damaging attack.
UN forces named the Po-2's nighttime appearance Bedcheck Charlie and had great difficulty in shooting it down — even though night fighters had radar as standard equipment in the 1950s, the wood-and-fabric-construction of the Po-2 gave only a minimal radar echo, making it hard for an opposing fighter pilot to acquire his target. As Korean war U.S. veteran Leo Fournier remarks about "Bedcheck Charlie" in his memoirs later on: "... no one could get at him. He just flew too low and too slow." On 16 June 1953, a USMC AD-4 from VMC-1 piloted by MajorGeorge H. Linnemeier and CWO Vernon S. Kramer shot down a Soviet-built Polikarpov Po-2 biplane, the only documented Skyraider air victory of the war. One Lockheed F-94 Starfire was lost while slowing to 110 mph during an intercept of a Po-2 biplane.

I saw a comic book once upon a time that repeated this story. At the time I put it down as a school boy fantasy. No biplane is going to take out a modern fighter. But this story tells me that maybe it wasn't a fantasy.