The novelistation of 'Battlefield' was written by Marc Platt.
Back Cover Blurb
Only a few years from now, a squad of UNIT troops is escorting a nuclear missile through the English countryside. At the nearby archeological dig, knights in armour are fighting battles with broadswords - and guns and grenades.
The Doctor arrives on the scene and meets two old friends; Brigadier Lethbridge-Stewart, called out of retirement to help in the emergency, and Bessie the souped-up roadster.
Ace escapes from death by drowning in a submerged spaceship, only to find herself at the mercy of a demon known as the Destroyer.
And why do the knights address the Doctor as 'Merlin'? What is the power of the sword that Ace retrieves from the bottom of the lake? Will Morgaine carry out her threat to destroy the World?