This is bunker FE 4 at Retinne.
The bunker is part of sector Fléron-Evegnée (FE) from de 2nd line of defense for the city of Liège. La Position Fortifiée de Liège 2, PFL 2.
The bunker is located at a fieldraod and a backyard and is overgrown with srcubs. Only the doorway is visiable. Also one of four bordermarkers is still present. The domain where the bunkers were located would be shielded with these markers. DN 1 means 'Defence National 1' pole 1.
When after the war the bunkers lost their strategic position for the defens of Belgium, the plot and bunker were sold. The iron door and shutters were sold as scrap.
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