bridgehead
From Longman Dictionary of Contemporary EnglishRelated topics: Militarybridgeheadbridge‧head /ˈbrɪdʒhed/ noun [countable] PMa strong position far forward in enemy land from which an army can go forward or attackExamples from the Corpusbridgehead• All we have to do is get in and establish a bridgehead, so to speak.• There were thousands more slaves now, working to finish the bridgehead.