A vvorthy speech spoken by His Excellence the Earle of Essex [electronic resource] : in the head of his armie before his arrivall at Worcester on Saterday last, being the 24 of September, 1642 : vvherein is declared every particular order and duty which His Excellence expects to be performed both by his commanders and souldiers : with a royall protestation taken by His Excellence and by him prescribed to be taken throughout the armie.