What is one difference between the cournot and stackelberg models?

Is that firms choose simultaneously in the Cournot model and sequentially in the Stackelberg model.

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.