Field Fortifications - Defense in Depth

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23-7-12 R-U Obstacles & Hx Hindenburg Line, Devil's Gardens - Invicta > .

23-7-12 Logistics. Russia's Fragility in Zaporizhia [Mapped] - gtbt > . skip > .

23-6-10 SatIm Rusciam Defensive Fortifications - Such > . 

23-6-2 How Ruscia Is Preparing for Ukraine’s Counteroffensive | WSJ > .

23-4-28 Ukrainian counter-offensive vs Ruscia's 'dragon's teeth' - Forces > .

22-12-18 Bakhmut & Ukraine Trench War - fortifications, H/burg WW1 - Perun > .

Bunkers & Shelters Under London (WW2, Cold War) - Faultline > .

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Hindenburg Line WW1 

The Hindenburg Line - Ludendorff's Defence In Depth - WW1 > .
The Hindenburg Line Breaks - The Lost Battalion Returns - WW1 > .
The Battle of the Selle - Ludendorff Resigns - WW1 > .