Editing Operation Sea Lion (section)

=== Post-war wargaming of the plan ===
{{Main|Operation Sea Lion (wargame)}}
A [[Operation Sea Lion (wargame)|1974 wargame]] was conducted at [[Royal Military Academy Sandhurst]].<ref>{{cite web
| url         = http://mr-home.staff.shef.ac.uk/hobbies/seelowe.txt
| title       = Archived copy
| access-date  = 1 June 2006
| url-status     = live
| archive-url  = https://web.archive.org/web/20080613114509/http://mr-home.staff.shef.ac.uk/hobbies/seelowe.txt
| archive-date = 13 June 2008
}}</ref>  The controllers of the game assumed that the {{lang|de|Luftwaffe}} had not diverted its daytime operations into bombing London on 7 September 1940, but had continued its assault against RAF airbases in the Southeast. Consequently, the German High Command, relying on grossly overstated claims of RAF fighters shot down, were under the erroneous impression that by 19 September RAF front-line fighter strength had fallen to 140 (as against a true figure of over 700); and hence that effective German air superiority might shortly be achieved.<ref>{{cite web
| url=https://drive.google.com/file/d/0B_JIBYcrqYoOdEVBS0dOWldlQ00/view|title = The Invaders reach Berkshire: Article from Daily Telegraph| access-date  = 26 April 2019}}</ref> In the Game, the Germans were able to land almost all their first echelon forces on 22 September 1940, and established a beachhead in south-east England, capturing Folkestone, and [[Port of Newhaven|Newhaven]], even though the British had demolished the facilities of both ports.  The British army forces, delayed in moving units from East Anglia to the Southeast by bomb damage to the rail network south of London, were nevertheless able to hold onto positions in and around Newhaven and Dover, sufficient to deny their use by German forces. Both the RAF and the Luftwaffe lost nearly a quarter of their available forces on the first day, after which it finally became apparent to the German command that British airpower was not, after all, on the point of collapse. On the night of 23/24 September a Royal Navy force of [[cruisers]] and [[destroyers]] was able to reach the Channel from [[Rosyth]], in time to intercept and destroy most of the barges carrying the second and third echelon of German amphibious landings with the crucial tanks and heavy artillery (for the game, these follow-up echelons had been held back from crossing the Channel on S minus one with the first echelon, instead sailing across on the night of S plus one). Without the second and third echelons, the forces ashore were cut off from reserves of artillery, vehicles, fuel and ammunition supplies; and blocked from further reinforcements. Isolated and facing fresh regular troops with armour and artillery, the invasion force was forced to [[surrender (military)|surrender]] after six days.<ref>The Sandhurst wargame was fictionalised in Richard Cox (ed.), ''Operation Sea Lion'' (London: Thornton Cox, 1974. {{ISBN|0-902726-17-X}}). An analysis by F-K von Plehwe, "Operation Sea Lion 1940", was published in the Journal of the Royal United Services Institution, March 1973.</ref>