Sugru is some kind of magic playdough invented by a Brit girl genius and marketed as space rubber or magic dust or something of the sort.  It can be molded and shaped into anything and can be used to repair stuff or invent stuff...

picture of Brit Girl Genius

A couple of Sugru engineers thought this was just the stuff for parts of a Gatling water gun they were thinking about.  It's hard to say what parts it was used for, but looks like a blast hosing down a few of your best pals, in color no less.  I might have to get some of this stuff...

picture of Sugru Gatling Gun

Video of gun in action

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The morning of D-Day saw American Rangers heading for Pointe du Hoc to silence the big 155mm guns believed to be installed at the top of the cliff. To assault the cliffs, bombardment from British Destroyers were to keep the German heads down along with air assault.  The rangers had rocket fired grappling hooks to scale the cliff by rope and  DUKWs equipped with ladders from London fire brigades. These ladders had Vickers K guns installed at their tops, to help keep the German at bay while men climbed up. 

picture of Vickers K gun

 

picture of Rangers climbing Pointe du Hoc

About half of the landing force made it to the cliffs, but an hour late and lost the element of surprise.  The Rangers that landed were on their own, as the reinforcements were redirected towards Omaha Beach due to the delay.... Which was a good thing for Omaho Beach, as the Rangers were partially responsible for getting the stalled landing off the beach.  This reduced force still made it to the top of the cliffs with few casualties and did secure the gun position.  The guns weren't installed, however, but Rangers used thermite grenades to disable them anyway.  Alas, the British ladders and guns couldn't be brought to bear due to the heavy surf.  The real threat was the Maisy gun position a few miles inland, which the Rangers did take out 3 days later.

picture of top of Pointe du Hoc