According to Britanica, "During the English Civil Wars two important battles occurred at Newbury: on September 20, 1643, 6,000 men fell in battle when the day was won by Parliamentary forces, and on October 27, 1644, the Royalists overcame their Parliamentary opponents and were able to relieve the local Donnington Castle" (par.1). In regards to Jane Austen's Mansfield Park, Newbury is mainly refered to as a place that characters in the novel pass through when going elsewhere; for example, Fanny and William sleep there briefly during a trip to Portsmouth (375).

Austen, Jane. Mansfield Park, edited by June Sturrock, 2nd ed., Broadview Press, 2020.