The answer is: Personal Memoir.
A memoir is a historical account or a selection of personal or public events that have occurred during the writer's life or that the author has experienced. In the excerpt, the composer of the memoir describes the the birds in the countryside and the moment he or she walked through the cemetery.
All the statements but the third one are correct.
Germany started World War II when it invaded Poland in 1939: The German invasion of Poland was a military action of Nazi Germany aimed at annexing the Polish territory. The technical operation, known as "White Case" (in German, Fall Weiss), began on September 1, 1939 and the last units of the Polish army surrendered on October 6 of that same year. It was the trigger of the Second World War in Europe and ended with the Second Polish Republic.
In the Battle of Britain, Germany used bombs to attack Great Britain: The Battle of Britain is the name by which the set of air battles fought in the British sky and on the English Channel is known, between July and October 1940, when Germany sought to destroy the Royal Air Force (RAF) to obtain the air superiority necessary for an invasion of Great Britain.
In the early stages of World War II, Germany demonstrated immense military power: The first German military movements were successful and brilliant, as in the blitzkrieg during the invasion of Poland (1939), Norway (1940), the Netherlands (1940), and above all, the incredibly rapid and successful invasion of France in the year 1940.
