[Sidenote: An. Dom. 1390.] Dominus Henricus Comes de Derbie per idem tempos profectus est in le Pruys, vbi cum adjutorio marescalli dictæ patriæ & cujusdam Regis vocati Wytot deuicit exercitum Regis de Lettowe, captis quatuor ducibus, & tribus peremptis & amplius quam trecentis, de valentioribus exercitus sapradicti pariter interemptis. Ciuitas quoque vocatur [Marginal note: Alias Vilna] Will in cujus castellum Rex de Lettowe nomine Skirgalle confugerat, potenti virtute dicti Comitis maximè atque suorum capta est. Namque qui fuerunt de familia sua primi murum ascenderant & vexillum ejus super muros, cæteris vel torpentibus vel ignorantibus, posuerunt. Captaque sunt ibi vel occisa quatuor millia plebanorum, fratre Regis de Poleyn inter cæteros ibi perempto, qui aduersarius nostri fuit Obsessumque fuit castrum dictæ Ciuitatis per quinque hebdomadas: Sed propter infirmitates, quibus vexabatur exercitus magistri de Pruys & de Lifland noluerunt diutiùs expectare. Facti sunt Christiani de gente de Lettowe octo. Et magister de Lifland duxit secum in suam patriam tria millia captiuorum. The same in English. About the same time L. Henry the Earle of Derbie trauailed into Prussia, where, with the helpe of the Marshall of the same Prouince, and of a certaine king called Wytot, hee vanquished the armie of the king of Lettowe, with the captiuitie of foure Lithuanian Dukes, and the slaughter of three, besides more then three hundred of the principall common souldiers of the sayd armie which were slaine. The Citie also which is called Wil or Vilna, into the castle whereof the king of Lettow named Skirgalle fled for his sauegard, was, by the valour of the sayd Earle especially and of his followers, surprised and taken. For certaine of the chiefe men of his familie, while others were slouthfull or at least ignorant of their intent, skaling the walles, aduanced his colours thereupon. And there were taken and slaine foure thousand of the common souldiers, and amongst others was slaine the king of Poland his brother, who was our professed enemie. And the castle of the foresaid Citie was besieged for the space of fiue weekes: but by reason of the infirmities and inconueniences wherewith the whole armie was annoyed, the great masters of Prussia and of Lifland would not stay any longer. There were conuerted of the nation of Lettowe eight persons vnto the Christian faith. And the master of Lifland carried home with him into his countrey three thousand captiues. * * * * * The voyage of Thomas of Woodstocke Duke of Glocester into Prussia, in the yeere 1391. written by Thomas Walsingham.