After June 1940 it seemed very likely that there would be a German invasion, this is because of several different factors. Firstly the Germans now had control of most of Europe including the coasts that surrounded the British's sea. The Germans had already invaded and beaten several other major powers such as France, who had recently surrender, meaning that they could confidently begin operation Sealion.
Once it had become apparent that the French army had been destroyed it became evident that Germans would launch an invasion against Britain. This lead to several steps being carried out to slow down any German advance. Firstly all children and pregnant woman who lived in cities were evacuated to countryside in preparation for air raids. The Local Defence Volunteers, which was made up of, injured soldiers, those to young or medically not allowed to fight and those who were in occupational jobs. The idea of these men was to give the main army extra power if a German invasion was to happen. To make sure that Britain had enough weapons and planes both woman and men worked in the factories for up to about 12 hours a day. Barbwire, anti-tank traps, mines and water mines were placed along beaches and coastal waters to slow any advance down. Finally road names and signposts were removed to confuse the Germans if they landed, however it created a lot of confusion amongst the British public instead.
The Germans attack planes were originally very different with the Army, Navy and Airforce coming up with different plans. However they all agreed that the Luftwaffe was needed to destroy Britain's air supremacy before an invasion fleet landed. The plan was firstly for the Luftwaffe to destroy all British planes and Airbases so that the navy could advance towards Britain and drop the army off without any air attacks from British planes. However all of Germanys forces were stretched especially the Luftwaffe's. The chief of the Luftwaffe said they needed more time to train pilots but Hitler refused and started the invasion plans anyway.
For the invasion to succeed an air battle followed, this battle came in 3 separate phases. Firstly during July and August of 1940 the Luftwaffe started to attack all shipping that entered British waters, the idea was to create a blockade, which stopped supplies and munitions from entering Britain. In the second stage, which started at the end of August, the Germans began attacking airfields, airbases and radar stations to stop the RAF from launching any counter attacks. The RAF lost 103 pilots, another 128 injured and 500 planes missing in just two weeks; at one stage there were 6 airfields out of action. If the German plans hadn't of changed then an invasion could have been on. In the final stage of the air battle and any invasion hopes, the Luftwaffe began attacking London. These attacks happened between September the 7th and 15th. There were attacks on the dock areas destroying factories and supplies. However this allowed the RAF to rejoin and replan its forces. During this period 57 German planes were destroyed. It is said this happened because some RAF bombers got passed the German Defenses and bombed Berlin, something Hitler had vowed would never happen.
There are several reasons for the RAF's victory that include the short flying time German planes had over Britain and the complacency of German Commanders. The majority of German planes could only last 30 minutes over Britain before having to return to German airbases to refuel, however the RAF could quickly re-fuel and launch planes back up. The German commanders also told pilots that British plane s had been destroyed so they would face no opposition even though they did in the end.
In conclusion I believe that German invasion of Britain, operation Sealion failed due to several factors. Firstly the lack of co-ordination between the German armed forces, secondly a lack of pilots and sudden changes in the Luftwaffe's tactics. I also think that the use of radar allowed Britain to conserve fuel meaning they could hang on for longer. The final reason is that while the Germans had 30 minutes of fly time over Britain and an hour to refuel before attacking again, we could stay in the air for longer and have quicker refuelling. This victory meant that Britain could be used later on as the base for the Normandy invasions. If this hadn't of happened a victory would have been almost impossible.
