The Wrath of The Awakened Saxon, by Rudyard Kipling, comes to mind:
It was not part of their blood,
It came to them very late,
With long arrears to make good,
When the Saxon began to hate.
They were not easily moved,
They were icy — willing to wait
Till every count should be proved,
Ere the Saxon began to hate.
Their voices were even and low.
Their eyes were level and straight.
There was neither sign nor show
When the Saxon began to hate.
It was not preached to the crowd.
It was not taught by the state.
No man spoke it aloud
When the Saxon began to hate.
It was not suddently bred.
It will not swiftly abate.
Through the chilled years ahead,
When Time shall count from the date
That the Saxon began to hate.
Another Kipling poem that all need to read is
“The gods of the copybook headings”
For the sin they do by two and two they must pay for one by one.
Do you know what that is from? I have a lot of collections of Kipling and can't remember seeing that.