This is why the Allies' secret DD tank failed on D-Day

If you’ve seen the blockbuster movies The Longest Day (currently on Netflix) or Saving Private Ryan, a big part of the story is how infantry fought through the obstacles on Omaha Beach (the wisdom of sending two divisions into that meat-grinder can be debated at another time).

But the lack of tank support wasn’t part of the plan. In fact, it was one hell of an instance where that notorious and unwelcome Murphy’s Law put in an appearance, costing the infantry some much-needed support. It would have been their secret weapon: the Dual-Drive, or DD, tank.

M4 Sherman modified into a DD tank. (British government photo)

The DD tank was a modified M4 Sherman that had a large canvas screen and propellers to enable it to swim in to shore from a distance. Tanks-Encyclopedia.com notes that the M4 had some good firepower for busting up fortifications — a 75mm gun with 90 rounds. At close range, that gun would more than do against the Nazi fortifications.

This is how the DD tank was supposed to work. Note the calm seas. On D-Day, they seas were rough. (YouTube screenshot)

There’s just one problem: the DD tanks weren’t tested in rough seas. Almost all of them ended up sinking when eight-foot-tall waves swamped them. And a tank on the bottom of the channel can’t provide support for the grunts. In short, the grunts had to do the hard by themselves.

So, take a look at this History Channel video, and a piece of D-Day history some folks would like to forget.

TOP ARTICLES
This is the latest version of the M9 service pistol

The M9A3 offers a bigger magazine, a user-friendly grip, and a host of improvements based on lessons learned from over three decades of service.

This is what the DoD has planned for a zombie apocalypse

It does touch on many of the pop culture elements of zombie lore, but it breaks things down to become applicable to most situations that would similar to an actual outbreak.

Some dirtbags messed with an Iwo Jima memorial — and Marines caught 'em on film

Officials say an Iwo Jima memorial in Fall River was doused with the contents of a fire extinguisher last weekend. Police are investigating

Vets are going to get a new ID card, and they'll be ready for use next month

The new identification card will provide employers looking to hire veterans with an easier way to verify an employee's military service.

This is the story behind the rise and fall of the Islamic State group

The Islamic State group, responsible for some of the worst atrocities perpetrated against civilians in recent history, appears on the verge of collapse.

Now the Iraqi army is going after the Kurdish forces who helped beat ISIS

Iraqi federal and Kurdish forces exchanged fire on Oct. 20, capping a dramatic week that saw the Kurds hand over territory across Northern Iraq.

This Kurdish female militia refuses to stop its hunt for ISIS terrorists

A Kurdish female militia, after helping free the city of Raqqa, said it will continue the fight to liberate women from the extremists’ brutal rule.

The US just sent nearly 1M bombs and missiles to Guam — here's why

Hint: There's this guy a few thousand miles away who's threatening to lob a nuke in their direction.

This is what the 400 US troops in Somalia are actually up to

The US has quadrupled its military presence in Somalia after Al-Shabab killed nearly 300 civilians in two truck bombings. Half of them are special ops troops.

The war between the US Army and Magpul is heating up over ice

Magpul officials are calling foul on the Army's claim that its rifle magazines don't work in the cold — and they say they can prove it.