The Germans had plans to invade the British Isles. It was named Operation Sea Lion, and the world might be a very different place if the assault had happened. Well, Warlord Games lets you play the "What-if?" game with their Operation Sea Lion and Operation Gigant kits. They've bundled them together and have them available to order now.
From the website:
Kick-start your invasion of the British Isles with the complete Operation Sea Lion and Operation Gigant campaign bundle.
First, lead a wave of assault boats across the channel with the fantastic Operation Sea Lion book, covering the desperate defence of the south coast by rag-tag bands of Home Guard and the disorganised survivors of Dunkirk.
Then take to the skies with Operation Gigant, and lead your crack Fallschirmjagers in a glider-borne attack deep into the heart of Northern England.
Bundled together for the first time, these books give you the complete campaign experience. Now you’ve got the opportunity to follow the threads of alternate history to their violent conclusion.