St George ?

ST George he was for England.

And before he killed the dragon

He drank a pint of English ale

Out of an English flagon.

For though he fast right readily

In hair-shirt or in mail.

It isn't safe to give him cakes

Unless you give him ale.

St George he was for England,

And right gallantly set free

The lady left for dragon's meat

And tied up to a tree;

But since he stood for England

And knew what England means,

Unless you give him bacon

You mustn't give him beans.

St George he is for England,

And shall wear the shield he wore

When we go out in armour

With the battle-cross before.

But though he is jolly company

And very pleased to dine,

It isn't safe to give him nuts

Unless you give him wine.

G. K. Chesterton

Has anyone any idea what this poem means?