Can you please check if everything is all right in these sentences I wrote on the second world war.

Thank you.

1) On the 1st of September 1939 the Germans invaded Poland; on the 3rd of September the Western Powers (France and England) declared war on Germany. 2) In April 1940 Hitler’s forces moved into Denmark and Norway; then they invaded Holland and Belgium and entered France.
3) King George VI appointed Prime Minister the Conservative Winston Churchill under whose strong leadership British resistance became extremely determined. The first years were terrible.
4) The evacuation of the British Expeditionary Force from France was made possible by the heroic help of all the British people; everybody who had a vessel of any kind joined the warships and contributed (?) to bringing most of the English soldiers back home.
5) In June 1940 Italy too declared war on the Western Powers; France capitulated, and the invasion of Great Britain seemed certain.
6) The Germans prepared it by trying to destroy the bases of the Royal Air Force in the south of England.
7) Heavy bomber raids continued day and night on London and other important towns. The Battle of England was won by the pilots of the Royal Air Force, who strenuously attacked the German fighters.
8) It was they who saved England in the terrible summer and autumn of 1940, before winter made invasion impossible.

1) On the 1st of September, 1939, the Germans invaded Poland; on the 3rd of September, the Western Powers (France and England) declared war on Germany.

2) In April 1940, Hitler's forces moved into Denmark and Norway; then they invaded Holland and Belgium and entered France.

3) King George VI appointed the conservative Winston Churchill to the position of Prime Minister, under whose strong leadership British resistance became extremely determined. The first years were terrible.

4) The evacuation of the British Expeditionary Force from France was made possible by the heroic help of all the British people; everybody who had a vessel of any kind joined the warships and helped to bring most of the English soldiers back home.

5) In June 1940, Italy, too, declared war on the Western Powers; France capitulated, and the invasion of Great Britain seemed certain.

6) The Germans prepared by trying to destroy the bases of the Royal Air Force in the south of England.

7) Heavy bomber raids continued day and night on London and other important cities and towns. The Battle of England was won by the pilots of the Royal Air Force, who strenuously attacked the German fighters.

8) It was they who saved England in the terrible summer and autumn of 1940, before winter made invasion impossible.

Nice job!

Sure, I can check these sentences for you. Here are the sentences you provided:

1) On the 1st of September 1939, the Germans invaded Poland; on the 3rd of September, the Western Powers (France and England) declared war on Germany.
- This sentence is grammatically correct and appears to accurately describe the sequence of events during the start of World War II.

2) In April 1940, Hitler’s forces moved into Denmark and Norway; then they invaded Holland and Belgium and entered France.
- This sentence is also grammatically correct and accurately describes the German military movements during the early stages of World War II.

3) King George VI appointed Prime Minister the Conservative Winston Churchill under whose strong leadership British resistance became extremely determined. The first years were terrible.
- This sentence is grammatically correct, but it would flow better if rephrased slightly: "King George VI appointed the Conservative Winston Churchill as Prime Minister, under whose strong leadership British resistance became extremely determined. The first years were terrible."

4) The evacuation of the British Expeditionary Force from France was made possible by the heroic help of all the British people; everybody who had a vessel of any kind joined the warships and contributed to bringing most of the English soldiers back home.
- This sentence is grammatically correct, but it could be improved for clarity: "The evacuation of the British Expeditionary Force from France was made possible by the heroic help of all the British people. Anyone who had a vessel of any kind joined the warships and contributed to bringing most of the English soldiers back home."

5) In June 1940, Italy too declared war on the Western Powers; France capitulated, and the invasion of Great Britain seemed certain.
- This sentence is grammatically correct and accurately describes Italy's declaration of war and the subsequent events during that period of World War II.

6) The Germans prepared it by trying to destroy the bases of the Royal Air Force in the south of England.
- This sentence is grammatically correct and accurately states how the Germans prepared for the invasion of Great Britain by targeting the Royal Air Force bases.

7) Heavy bomber raids continued day and night on London and other important towns. The Battle of England was won by the pilots of the Royal Air Force, who strenuously attacked the German fighters.
- This sentence is grammatically correct and correctly highlights the heavy bombing raids on London and the crucial role played by the Royal Air Force pilots during the Battle of Britain.

8) It was they who saved England in the terrible summer and autumn of 1940, before winter made invasion impossible.
- This sentence is grammatically correct and effectively communicates that it was the Royal Air Force pilots who played a pivotal role in saving England during the critical period of 1940.

Overall, your sentences are well-written and accurately convey key events of the Second World War.