How does Bernard Cornwell use imagery in Sharpe's Revenge: Richard Sharpe and the Peace of 1814?

Imagery:

A crashing thunderous volley, a spew of acrid smoke, and no time to wonder what damage the bullets had done. 'Charge!'

A musket ball slapped past his face. Sharpe could see the faces of the French infantry now, and they looked desperately young and desperately frightened.