How mines were adapted to the five D-Day beaches

Did all five D-Day beaches have landmines, and how did seawater affect their use?

Yes, but the pattern varied: tidal beaches emphasized mined landing-craft obstacles, while dry sand and dunes could hold anti-personnel mines.

Beaches with strong tidal movement commonly placed explosives on obstacles intended to damage landing craft approaching at high water. Where sandbanks or dunes stayed above the tidal line, defenders could also use anti-personnel mines against troops crossing the beach. The Atlantic Wall was not a uniform belt: local hydrography determined which obstacles and mines could remain effective.