In Animal Farm, what does the song "The Beasts of England" symbolize?

The song is
both a battle cry for the rebellion on Manor Farm and an anthem that helps the animals keep the
spirit of the rebellion alive in their hearts.  After Manor Farm becomes , the feeling among the
animals is that things will be better now that they are ruling themselves.  They are no longer
under the rule of the humans who has taken us for granted.  The beasts of England are the humans
who have abused the animals.

When the animals successfully defend the farm
against the humans in the Battle of Cowshed, the song is even more important to the
animals. 

"News of the Rebellion at Animal
Farmbegins to spread, and animals across the countryside are singing "Beasts of
England." The neighboring farmers, led by Mr. Pilkington of Foxwood and Mr. Frederick of
Pinchfield Farm, attempt to retake Animal Farm by force."