Christ! Haven't heard this since I was about eight! As far as I can remember it goes something like this

       G             C            Am         D
When a knight won his spurs in the stories of old

       G          C            D          G
He was gentle and brave he was gallant and bold

       G             (Em7)    C            D
With a shield on his arm and a lance in his hand

    G          C         D                G
For God and for valour he rode through the land


I put the Em7 in brackets cos it's optional - you can just stick with the G, but I remember feeling particularly rakish at that tender age dropping the occasional minor seventh in! Hope that helps!