How do you find what your great grandfather did in the First World War?

To find out what your great grandfather did in the First World War, start by gathering any family documents, letters, or photographs that might provide clues about his service. Next, check military records, such as enlistment papers, service records, and pension files, which can often be accessed through national archives or online databases. You can also explore local libraries or historical societies for resources related to his regiment or geographic area. Finally, reaching out to genealogy websites or forums might connect you with others who have researched similar topics.