[sammyg2]

Originally Posted by Nickshu

WW1 ended 11/11/1918, so not sure how much of a factor the flu outbreak was on the war itself, if any.

Definitely killed a lot of people after the war was over, but the non-battle deaths data was in reference to the war years 1914-1918, not after.

in the fourth dreadful year of the war, as the American Expeditionary Forces (AEF) assumed fighting strength and prepared their first great offensive against the Germans, the flu struck. By the War Department's most conservative count, influenza sickened 26% of the Army—more than one million men—and killed almost 30,000 before they even got to France.
On both sides of the Atlantic, the Army lost a staggering 8,743,102 days to influenza among enlisted men in 1918. (p. 1448)
The Navy recorded 5,027 deaths and more than 106,000 hospital admissions for influenza and pneumonia out of 600,000 men, but given the large number of mild cases that were never recorded, Braisted put the sickness rate closer to 40%. (p. 2458)

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2862337/