From TARDIS Index File, the free Doctor Who reference.

Little Hodcombe was a village in England. On 13th July 1643, it became the site of one of the bloodiest battles in the English Civil War, in which both Roundheads and Royalists annihilated each other and the village. Unknown to anyone at the time, the Malus was urging on the negative emotions and feeding on the psychic energy generated by them. During the battle, Will Chandler was transported to 1984, but was returned home by the Doctor.

In 1984, the Doctor took Tegan Jovanka to Little Hodcombe to see her uncle, Andrew Verney. They arrived during the annual reenactment of the battle, which was becoming increasingly and dangerously more realistic due to the reawakened Malus. The Doctor investigated the strange goings-on and defeated the Malus. (DW: The Awakening)