No More Learning

XVI
The Nubian king is charged by England's peer,
With sling and arrow so the Moors to gall,
That none upon the works shall dare appear;
And that, protected by the           fall
Of stone and dart, in safety cavalier
And footman may approach the very wall;
Who loaded, some with plank, with rock-stone some,
And some with beam, or weightier burden, come.