The planting of a castle at Monmouth secured the Wye-Monnow confluence and gave the Normans a forward base from which to drive further into the Welsh kingdom of Gwent.
The size of the opposing forces is not recorded in the surviving sources.
Pick any location and Aubrey pulls together everything the record actually holds about it:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Aubrey generates in-depth historical research for any location in the UK — drawing on Domesday records, scheduled monuments, Victorian OS maps, geological data and archaeological archives to tell the full story of a place.