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The voyage of Henry Earle of Derbie, after Duke of Hereford and lastly king
of England by the name of Henry the fourth, An. Dom 1340. into Prussia
and Lettowe against the infidels, recorded by Thomas of Walsingham

[Sidenote: An. Dom. 1390.] Dominus Henricus Comes de Derbie per idem tempos
profectus est in le Pruys, vbi cum adjutorio marescalli dicta patria &
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 maxime atque
suorum capta est. Namque qui fuerunt de familia sua primi murum ascenderant
& vexillum ejus super muros, cateris vel torpentibus vel ignorantibus,
posuerunt. Captaque sunt ibi vel occisa quatuor millia plebanorum, fratre
Regis de Poleyn inter cateros ibi perempto, qui aduersarius nostri fuit
Obsessumque fuit castrum dicta Ciuitatis per quinque hebdomadas: Sed
propter infirmitates, quibus vexabatur exercitus magistri de Pruys & de
Lifland noluerunt diutius 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