alternatehistory.com

Background
By 1918 Britain had learned some bitter lessons about modern littoral or amphibious warfare. As early as 1917 the Brits were building first generation assault landing craft, floating docks, & other accouterments for beach assaults and littoral warfare. Why these lessons were not better preserved and built on is a interesting question I'll leave to experts.

The PoD
Post 1918 British begins, like the USN to preserve and build a specialized expeditionary/littoral warfare force much like the USN did in the 1920s. This need not be a large force, a couple of brigade like the US Navy formed of its Marines. What are the potential knock on effects of this from the 1920s.
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