Yup, all the ones you answered are correct.
In the aftermath of Kirghiz attacks on the North, it was alleged that Langdarma had been assassinated by a Buddhist hermit, which fit well with his portrayal of anti-Buddhism. However, some historians disagree with those accounts, so the claim remains alleged.
Major Lanoe Hawker was described as "the British Boelcke" by Manfred von Richtofen, the Red Baron, and is considered to be the Baron's most prestigious kill in his dogfighting career.
Henry Tandey during the battle of Marcoing, a Private at the time, had Adolf Hitler in his line of fire but did not shoot, because he would not shoot a wounded man. Hitler had been an Austrian Corporal at the time, and years later he sought the records of Tandey and thanked him, as well as framing a picture of him on the wall. Before Tandey died he was quoted as saying "If only I had known what he would turn out to be. When I saw all the people, woman and children, he had killed and wounded I was sorry to God I let him go".
Someone else will have to rep him for the bonus, I don't think I can. Still need the other two and there's still a bonus to be had.
All the Best,
Chris
Achtung! 0v3rl0rD