- E-bookThe Battle for the Maginot Line, 1940Clayton Donnell
- E-bookBreaking the Fortress Line, 1914Clayton Donnell
- E-bookEben-Emael & the Defence of Fortress Belgium, 1940Clayton Donnell
- E-bookThe Defence of Sevastopol, 1941–1942Clayton Donnell
- E-bookSerie: FortressGordon L. Rottman
- E-bookSerie: CampaignPeter Armstrong
- E-bookSerie: New VanguardChris Bishop