Question: When was the person who was shot down and killed by Manfred von Richthofen, the "Red Baron" during an air battle of which Robert Saundby was present, born?

full_context: Document 1: Snowy Evans: Willy John "Snowy" Evans (  1891 –1925) was a Lewis machine gunner in the Royal Australian Artillery (RAA) during World War I. Unsolved History, produced by Discovery Channel credited him with firing the shot that killed Manfred von Richthofen ("The Red Baron"), near Vaux-sur-Somme, France on 21 April 1918. However, most sources attribute the feat to Sergeant Cedric Popkin of the 24th Machine Gun Company. Other sources have suggested that Gunner Robert Buie, also of the 53rd Battery, fired the fatal shot, but there is now little support for this theory.
Document 2: Eddie Rickenbacker: Edward Vernon Rickenbacker (October 8, 1890 – July 23, 1973) was an American fighter ace in World War I and Medal of Honor recipient. With 26 aerial victories, he was America's most successful fighter ace in the war. He was also considered to have won the most awards for valor by an American during the war according to the April 2017 VFW magazine in their special World War I edition.
Document 3: George Hackwill: Captain George Henry Hackwill {'1': ", '2': ", '3': ", '4': "} (22 December 1892 – 4 July 1954) was an English World War I flying ace credited with nine aerial victories. His most notable victory was his role in shooting down a German Gotha G.V, over Essex on the night of 28 January 1918. This was the first victory ever achieved in combat between aircraft at night.
Document 4: Werner Mölders: Werner Mölders (18 March 1913 – 22 November 1941) was a German fighter pilot during World War II and a leading German fighter ace. He became the first pilot in aviation history to claim 100 aerial victories—that is, 100 aerial combat encounters resulting in the destruction of the enemy aircraft, and was highly decorated for his achievements. Mölders was instrumental in the development of new fighter tactics that led to the finger-four formation. He died in an air crash in which he was a passenger.
Document 5: Lothar von Richthofen: Lothar Freiherr von Richthofen (born Lothar Siegfried Freiherr von Richthofen; 27 September 1894 – 4 July 1922) was a German First World War fighter ace credited with 40 victories. He was a younger brother of top-scoring ace Manfred von Richthofen (the "Red Baron") and a distant cousin of Luftwaffe Field Marshal Wolfram von Richthofen.
Document 6: Hans Imelmann: Leutnant Hans Imelmann IC was a World War I flying ace credited with six aerial victories. As a founding member of one of Germany's original fighter squadrons, he was shot down and killed before he reached his twentieth birthday.
Document 7: Cedric Popkin: Cedric Bassett Popkin (Born 20 June 1890, died 26 January 1968) is considered the person most likely to have killed German ace Manfred von Richthofen — also known as the "Red Baron" — on 21 April 1918. Popkin was an anti-aircraft (AA) machine gunner with the First Australian Imperial Force (AIF), during World War I.
Document 8: Lanoe Hawker: Lanoe George Hawker VC, DSO (30 December 1890 – 23 November 1916) was a British First World War flying ace. Having seven credited victories, he was the third pilot to receive the Victoria Cross, the highest decoration for gallantry awarded to British and Commonwealth servicemen. He was killed in a dogfight with the famous German flying ace Manfred von Richthofen ("The Red Baron"), who described him as "the British Boelcke".
Document 9: Douglas Bader: Group Captain Sir Douglas Robert Steuart Bader, ( ; 21 February 1910 – 5 September 1982) was a Royal Air Force flying ace during the Second World War. He was credited with 22 aerial victories, four shared victories, six probables, one shared probable and 11 enemy aircraft damaged.
Document 10: Robert Saundby: Air Marshal Sir Robert Henry Magnus Spencer Saundby {'1': ", '2': ", '3': ", '4': "} (26 April 1896 – 25 September 1971) was an RAF officer whose career spanned both World War I and World War II. He distinguished himself gaining five victories during World War I, and was present during the air battle when Lanoe Hawker was shot down and killed by Manfred von Richthofen, the "Red Baron". He is chiefly remembered for his role as Deputy AOC in C Bomber Command under Sir Arthur 'Bomber' Harris during the latter part of World War II.
Document 11: Sir Arthur Harris, 1st Baronet: Marshal of the Royal Air Force Sir Arthur Travers Harris, 1st Baronet, {'1': ", '2': ", '3': ", '4': "} (13 April 1892 – 5 April 1984), commonly known as "Bomber" Harris by the press and often within the RAF as "Butcher" Harris, was Air Officer Commanding-in-Chief (AOC-in-C) RAF Bomber Command during the height of the Anglo-American strategic bombing campaign against Nazi Germany in the Second World War. In 1942, the British Cabinet agreed to the "area bombing" of German cities. Harris was tasked with implementing Churchill's policy and supported the development of tactics and technology to perform the task more effectively. Harris assisted British Chief of the Air Staff Marshal of the Royal Air Force Charles Portal in carrying out the United Kingdom's most devastating attacks against the German infrastructure and population, including the Bombing of Dresden.
Document 12: Norman Douglas Holbrook: Commander Norman Douglas Holbrook VC (9 July 1888 – 3 July 1976) was a British naval recipient of the Victoria Cross (VC), the highest award of the British honours system. Holbrook was the first submariner to be awarded the VC and it was the first naval VC gazetted in the First World War.
Document 13: Max Immelmann: Max Immelmann (21 September 1890 – 18 June 1916) "PLM" was the first German World War I flying ace. He was a pioneer in fighter aviation and is often mistakenly credited with the first aerial victory using a synchronized gun. He was the first aviator to win the "Pour le Mérite", and was awarded it at the same time as Oswald Boelcke. His name has become attached to a common flying tactic, the Immelmann turn, and remains a byword in aviation. He is credited with 15 aerial victories.
Document 14: Manfred von Richthofen: Manfred Albrecht Freiherr von Richthofen (2 May 1892 – 21 April 1918), also known as the "Red Baron", was a fighter pilot with the German Air Force during World War I. He is considered the ace-of-aces of the war, being officially credited with 80 air combat victories.
Document 15: List of victories of Werner Voss: Leutnant Werner Voss (13 April 1897 – 23 September 1917) was a friendly rival of World War I's leading ace, Manfred von Richthofen. Richthofen himself considered Voss as the only pilot with the potential to exceed Richthofen's aerial victory score. When Voss was killed in action, he had scored 44 victories. As can be seen by the list below, his victory roll is well documented.
ground_truth: 30 December 1890