noun (n)

• a bridgehead on the enemy's shoreline seized by an amphibious operation(noun.location)

  Example:
  The Germans were desperately trying to contain the Anzio beachhead.
  

  source: wordnet30
• an initial accomplishment that opens the way for further developments(noun.act)

  Example:
  The town became a beachhead in the campaign to ban smoking outdoors.
  

  Synonym:
  foothold
  

  source: wordnet30