When war was declared on September 3, 1939, very few in Britain would have imagined that, within a year, the UK would stand alone in Europe against Germany.
Equally, they would never have envisaged that Britain would be in danger of being invaded in 1940.
The Battle of Britain was derived from a famous speech delivered by Prime Minister Winston Churchill in the House of Commons on June 18, more than three weeks prior to the generally accepted date for the start of the battle.
It was the first major campaign to be fought entirely by air forces, with the German Air Force having a far superior number of aircraft.
During the battle, 544 British and allied aircrew were killed, 422 wounded and 1,547 British aircraft destroyed.
On September 15, the battle ended and the immediate plan to invade Britain was abandoned.
Around this date, members of the RAFA make a national appeal for donations to their charity.
The money helps members, former members of the RAF and their dependants who are in need.
A spokesman for Cranwell RAFA said: “On Saturday, September 19, in Sleaford and Ruskington, members of the Cranwell branch will be seeking your financial support.
“Last year, the efforts resulted in nearly £10,000 being collected and all the signs are that this should be exceeded this year with your help in this 75th anniversary year of the Battle of Britain.”
l A special service is being held at Sleaford Parish Church on Sunday at 10am to mark the 75th anniversary of the Battle of Britain.