You go back to 100 years ago of the US and live there for one month with money, supplies, and equipment that you bring along.
You soon find out that millions of people are suffering from a severe pandemic caused by the H1N1 virus with genes of avian origin.
You read about a mustard gas attack in Belgium as part of the World War I. A group of German soldiers were wounded by the attack. You noticed one of the soldiers is Adolf Hitler who is temporarily blinded.