Knight to Knight, Come Forth

Up on the Gog Magog Hills: shout a challenge here by moonlight, the old story says, and a dark knight will ride out to meet you.

Around 1211 the chronicler Gervase of Tilbury wrote down a tale he said came from country people near Cambridge. If a lone warrior rode into the ringed hilltop camp at Wandlebury on a moonlit night and called out a challenge, a mysterious armed knight would appear and charge. The Norman baron Osbert son of Hugh tried it, unhorsed the phantom and led its black horse away as a prize, but was struck in the thigh by a thrown lance. At cockcrow the coal-black horse broke its reins and vanished, and Osbert's wound was said to reopen every year on the anniversary of the fight.

One sourceOnly one written account of this legend has been found so far.