Biggest failures in history

Millions died, yes, but that was not the standpoint from which I was looking. I was looking from a military standpoint.
As for costs... we don't really know how much in monetary it cost, but, uh, he was the Emperor, does it really make a difference?
And in the case of the Mongolians, they got through because a tratior opened the gate for them. The wall itself was never destroyed. It was, in this case, a matter of human error, not of tactical inefficiency. Every general knows that every wall is only as strong as those who man it.

So it was opened just like a Byzantine solider opened up the walls to Constantinople and allowing the ottomans into the city and thus conquering it.

Didn't the Mongolians just walk around the wall or something?

Well, even the Emperor had to pay the engineers who built the wall and that money comes from the very citizens who pay taxes.

I thought they just went around the wall, not through the gates.

Napoleon and Hitler's invasions of Russia.

At the time it was built it protected the Chinese but as they expanded the wall no longer covered this new conquered lands so therefore the mongols could go around it and they also went through with a traitor it is in fact both

We are all aware that it took sixty years for the Mongolians to conquer china right and the great wall was build in the 5th century B.C.E?

I'll cast a vote for the Maginot Line.

Seriously, let's spend all our money building an impenetrable defensive line across PART of our border.
There's no way the Germans would just go around it, right?

Police action against occupy protesters in Oakland.
Police is just fueling the thing by doing that...

The French thought that there was no need to extend the Line all the way to the coast. They thought: If the Germans attack us through Belgium, we can easily stop their advancing armies. However the French, Belgians, and the British Expetionary Force got pincered and defeated.

Could you provide a link?

The Maginot Line, was a pretty good defense when you think about it. Tough the french where still under the assumption that the war would play out exactly like the first world, not realizing it was a whole new war. Had the French changed there strategics (not relied so heavily on the Maginot lies and the Germans being to slow to reach Paris) Then at the very least the French would have lasted alot longer, tough i would go as far as to say that the entire German invasion would have halted.

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Germans used the same tactic of WWI to invade France in WW2, or be it, they invaded the Low Countries first, then jumped on France, totally ignoring the Maginot Line.

and then bombed the shit out of it.

What if the Germans expanded the Maginot line to Dunkirk?

Impossible. Would end up the same way as China with it's Great Wall. The demand it would place upon France would be too (d*mn) high.

It's not just this or that or those, that caused the defeat for the French Army.
It's the clinging to outdated doctrines, army and tactics, the political situation at the times and sheer bad luck.
At one point it could've gone either way, with the German spearhead being surrounded and cut off instead of the scenario as we know it today.
It's only because of men like Von Rundstedt and Manstein or Rommel that Fall Gelb had any chance of succeeding.

Yep, definitely due to outdated doctrines, the French didn't really adapt their tactics to use tanks to full effect, while the Germans concentrated their tanks in a spearhead to make a full blown attack, the French still used tanks as some kind of support for infantry. Btw, French tanks were as good as Germans ones, if not better.

Not really, they had 20 years to build it...

Better, they were just spread out everywhere and placed mainly on the direct border with Germany.

That little strip from Basel to Luxembourg costed 3 Billion French Francs, which due to it's high cost in construction and upkeep left the actual army underfunded.
And that strip is only 40% of what the distance would be if they constructed it from Basel to Dunkirk.

French tanks were deployed as infantry support weapons, while the German tanks were deployed in their own regiments which allowed them greater freedom of movement.
Actually the biggest tank battles during the invasion were fought in Belgium. (Battle of Hannut and Battle of Gembloux)
But true enough, too much of the French forces were concentrated in the wrong areas.