Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great read on little known chapter in the Battle of Britain

This is a wonderful book giving an account of the unsung heroes of the Battle of Britain...Polish pilots who had fled their native country when occupied by Nazi Germany and went to England to continue the fight. The story is written in a narrative style that features great insight on both the personalities and battles of these brave men. The book includes footnotes and useful tables, photos and charts including aerial victories/losses.One of the most poignant moments is the conclusion...where we learn how thier hope of returning to a free Poland is betrayed by the very allies they fought for. Many never return to Poland. A must read for WW II buffs and those interested in Polish history.