Winsor McCay’s The Sinking of the Lusitania is a silent movie created in 1918 animated to portray the 1915 sinking of RMS Lusitania after it was struck by two torpedoes fired from a German U-boat; an event of which no recorded film footage is known to exist. It was the very first recognised example of animated documentary.
https://en.wikipedia.org/wiki/Animated_documentary
Walt Disney’s Victory Through Air Power (1943) is a feature film based on the 1942 book Victory Through Air Power by Alexander P. de Seversky.
https://en.wikipedia.org/wiki/Victory_Through_Air_Power_(film)
Abigail Gelston 