(FYI, some material about diseases comes from internet research.)
If you're sick of the reading-and-questions rut that I was sick of by the end of the year, this is a less boring way to assess both students' comprehension and ability to justify their answers and opinions. It's very similar to reading-and-questions, but it has a unique enough spin where they'll be busy being excited that they get to be "doctors." They have a diagnosis sheet and have to connect a disease's symptoms to what a soldier is experiencing, thereby "diagnosing" him. (No disease is used more than once, and six out of the eight diseases are used for diagnosis.)
This lesson personalizes WWI into individual accounts, and it's a bit gross, but nothing disturbing. (One disease mentioned is syphilis, but even my most immature students acted like adults about it. It also shows that you're confident in their ability to act like adults.)
Enjoy this lesson! It's good for small groups or individual work. I've had a lot of success with it and am happy to have seen my creativity pay dividends.