Amajor event in the french revolution hapenned on july 14, 1789, when a mob stormed the bastille, a notorious prison in paris. how can historians today use primary sources to determine that this date is accurate? : a) read french letters from the 1700s and search for references to the event's date. b) ask french citizens who directly experienced the event to confirm the date. c) examine a european history book popular in modern-day france. d)check websites that can be edited by the public to determine a popular consensus