What is Pilkington's response to Animal Farm's request for help? Is it a good or bad response?

Whymper informs Napoleon that the banknotes are forgeries. Napoleon sentences Frederick to death by boiling alive and tries to reconcile with Pilkington. The next morning, Frederick and his armed men overtake the farm. Napoleon considers calling Pilkington for help, but Pilkington sends a note that says, “Serves you right.” As the animals watch helplessly, Frederick and his men blow up the windmill.