I had the privilege of collaborating on Trench Hammer by Nordic Weasel games. Each maneuver element is a squad/section or heavy weapons team and it is targeted for quick play with a platoon or so per side. It is scale agnostic, I personally choose to use 10mm Pendraken Miniatures, they have a very comprehensive range and allow me to play in a smaller space with room to maneuver. You can see my initial forces on my blog here and all of my blog posts for this project here.
Here is my personal reading list for World War 1, and suggestions are welcome!