Kearsley's Traveller's Entertaining Guide Through Great Britain (1803):
Barnet, a market town remarkable for the decisive battle fought between the houses of York and Lancaster in 1471, in which the great earl of Warwick was slain. The place supposed to be the field of battle is a green spot, a little before the meeting of the St Albans and Hatfield roads; and in 1740 a stone column was erected to commemorate the event.
Inns : Red Lion, Green Man.
Use the "Show me" link to locate Barnet on the map. You may need to scroll down to see Barnet highlighted.