Students usually love this trench warfare lesson!
This PowerPoint outlines the conditions of trench warfare in Europe during World War I. It includes several interesting images, and it requires students to take notes and answer questions. At the end of the PowerPoint, I have included a journal-writing assignment to assess student understanding of trench warfare.
This PowerPoint can be used prior to the "Dulce Et Decorum Est" lesson plan, which requires students to analyze a poem about trench warfare. I have also made that product available for sale.