I have always assumed that the past tenses follow an order in time from earliest to latest as follows: pluperfect, perfect, imperfect. I order the last two in that way because the action is completed in perfect and not in imperfect. I recently saw this: Before the general entered the town, we feared him. translated as: ducem, antequam oppidum intravit, timebamus. The use of the imperfect here has confused me as I did not expect to see it before a perfect event. Could someone please correct my logic?