|James Gimbel (Left: Gimbel Family; Right: Michael Colbruno)|
The close quarters and massive troop movements of World War I hastened the pandemic and probably both increased transmission and augmented mutation. The war may also have increased the lethalness of the virus and some speculate the soldiers' immune systems were weakened by undernourishment, as well as the stresses of combat and chemical attacks.
After being drafted, Gimble ended up in France via Camp Kerney in San Diego, Arizona, Canada and eventually England. In a letter to his parents, he bemoaned the fact that he was too ill to help a fellow Berkeley soldier who was lying on the ground. He died in France on November 17 of the flu.
Sources: Gimbel family history; Berkeley Gazette; Wikipedia