Sentence:  And over all the fields themselves did muster, / With bils and glayves making a dreadfull <WSD>luster</WSD>; / That forst at first those knights backe to retyre: / As when the wrathfull "Boreas" doth bluster, / Nought may abide the tempest of his yre, / Both man and beast doe fly, and succour doe inquyre. 
Meaning of the word marked with <WSD> tags:  Shine, polish or sparkle.