There are many companies who offer battlefield tours and I’ve included a link to one I’ve used and can personally recommend.  If others have recommendations I’m happy to add them to this list.

Flanders Battlefield Tour
I was fortunate enough to spend a day visiting the battlefields and cemeteries in and around Ypres.  I arranged a private tour with Flanders Battlefield Tours and wholeheartedly recommend them. They put together a custom tour that helped me follow in the footsteps of my great-grandfather Herbert Clifford.  If you are planning a visit to Flanders I recommend you get in touch with Genevra and Jacques.