BEACHHEAD
beachhead, foothold
(noun) an initial accomplishment that opens the way for further developments; “the town became a beachhead in the campaign to ban smoking outdoors”; “they are presently attempting to gain a foothold in the Russian market”
beachhead
(noun) a bridgehead on the enemy’s shoreline seized by an amphibious operation; “the Germans were desperately trying to contain the Anzio beachhead”
Source: WordNet® 3.1
Etymology
Noun
beachhead (plural beachheads)
(military) An area of hostile territory (especially on a beach) that, when captured, serves for the continuous landing (or movement into position) of further troops and material
(by extension) An initial success that ensures the possibility of further advances in a project; a foothold.
Source: Wiktionary