Knock with tremor — Jack and the Bean-Stalk

Knock with tremor-1
These are Caesars-
Should they be at Home
Flee as if you trod unthinking
On the Foot of Doom-

These receded to accostal 6
Centuries ago-
Should they rend you with "How are you"
What have you to show?
(F.1333/J.1325)
[1–9]:: This poem is about Jack and the Bean-Stalk (1807) by Benjamin Tabart.
[2, 3] Caesars, they:: giants.
[4] you:: Jack.
[5] Doom:: the giant the doom of human being.
[7] Centuries ago:: the story was set in the ninth century.