[jmacusa]

With Patton the truth lies somewhere in between. But as warfare has evolved forts have become obsolete. Mobility is what warfare now is all about. As I pointed out, in the modern era one need only to look at the Maginot Line(and ‘’Maginot Thinking’’), Hitlers Atlantic Wall and the Siegfried Line to see the futility of fixed fortifications. As stout as any fort is/was it can just as quickly become a tomb.

[Sherman Logan]

In the modern era I would agree. Certainly tactical nukes and even the bunker busters will take out any conceivable fortification.

But cities can be considered a type of fortification, and are certainly much easier to defend than open ground.

And during the period from WBTS to WWII, fortifications were ubiquitous, because technology made one soldier in a trench the equal of 2 or 3 (more during early years of WWI) assaulting it. Later tech of course eliminated some of this advantage.

IOW, while fortifications cannot likely be held forever, they can certanly make it a lot easier to bleed the enemy.