The primary meaning of the Past Continuous is that of a past action shown in its progress at a given past moment, e. g.:

• The door was slowly opening, and Anthony found himself gazing into a pair of pale-gray hooded eyes. (Gordon)
• She followed his gaze through the falling rain and saw a man and a girl coming from the large block of flats opposite her home. Now they were getting into a little motor car. (Gordon)

Simple Past is used to:

— talk about a past event which took place at a definite point in time

·         We went to the theatre last night.

·         Shakespeare died in 1616.

·         Did you have a good time on holiday?

·         When did she come?

·         Who saw Peter yesterday?

·         What did you do at the weekend?

·         Why didn't you phone me on Tuesday?

·         Why were you so angry?

·         Was Tom at work on Friday?