In particular, geological surveys conducted from 2003 to 2009 by the Battlefields Trust, a charitable organisation that protects and studies old English battlefields, show that the southern and eastern flanks of Ambion Hill were solid ground in the 15th century, contrary to Williams's claim that it was a large area of marshland.
Særlig viste geologiske undersøgelser, gennemført fra 2003 til 2009 af Battlefields Trust, en velgørende organisation, der værner og studerer gamle engelske slagmarker, at den sydlige og østlige side af Ambion Hill havde været fast grund i 1400-tallet, i modsætning til Williams påstand om at det havde været et stort sumpområde.