Possible Clues:

• Book giving quote Four legs good, two legs bad
• No-man's-land taken over by Napoleon
• Napoleon is a commander in it
• Not an arable parable?
• Siren posed inelegantly - in a sort of slump
• Rural scene of Boxer Rebellion
• Following a take-over the directors were real swine
• Bird turned tail, following in fear where Napoleon led
• Where old Major incited revolution
• Bird in upset — female in distress in beastly work