Fairfax Entrenchment, a curved trench believed to have been the site of a skirmish between the two warring sides in the English Civil War, was on Harden Moor. Although there is no known documentary evidence of a fight, it is known that Thomas Fairfax stayed at Harden Grange and most likely he ordered a trench to be dug as a defensive measure. The site is now part of the St Ives estate which has also been converted partly into a golf course. At the time of the supposed skirmish, the site was part of Harden Moor and the area was left undeveloped by the Ferrand family (the local landowners) in deference to the rumour that bodies of fallen civil war soldiers were buried there. Large scale mapping indicates the shape and curve of the trench with the soldiers graves being behind the northern curve of the trench and just south of Altar Lane.