Sentence:  Lives he, good uncle? thrice within this hour I saw him down; thrice up again, and fighting; From helmet to the <WSD>spur</WSD> all blood he was. 
Meaning of the word marked with <WSD> tags:  A rigid implement, often roughly y-shaped, that is fixed to one's heel for the purpose of prodding a horse. Often worn by, and emblematic of, the cowboy or the knight.