you might look into the 1974 Sandhurst wargame, which presupposes a successful initial landing - 330,000 men. It gives the Royal Navy the Stupids just to get the troops across, then assumes everything goes normally from there
The Army has the whole situation in hand, with over 300,000 German men killed or captured, in 5 days
a report of the wargame:
Why are posters still quoting a game from 40 years ago? This is 2014. We have the ability to do our own wargame.
Last year we did a game of a second IJN attack on Hawaii. Who would like to see a wargame on this site done in the same way for Sealion?