Reading on medieval defences and company command

Which recently read books does the panel recommend?

Warfare, Raiding and Defence in Early Medieval Britain is recommended for its interpretation of defensive earthworks, while Demolisher is praised for its fictional treatment of an officer struggling with company command.

Erik Grigg's Warfare, Raiding and Defence in Early Medieval Britain examines early-medieval defensive ditches and their purposes across Britain. Its interpretation changes how the defence of the British Isles during the Anglo-Saxon period can be understood. The other recommendation is Demolisher, a Warhammer 40,000 novel following Steel Tread. Its appeal here is the portrayal of an officer who is poorly suited to company command but must make do with the position and resources available. That command problem is a fictional illustration, separate from the historical study of British earthworks.