public void addPreviouslyNavalBombardmentSource(final Collection<Territory> territories){
  m_bombardedFromTerritories.addAll(territories);
}

public void addPreviouslyNavalBombardmentSource ( final Collection < Territory > territories ) { m_bombardedFromTerritories . addAll ( territories ) ; }
marks the set of territories as having been the source of a naval bombardment .
