Banana
Banana invented Dig Defence.
1969 by the us department of defence.
Shovel.
When someone wanted to dig into hard earth.
A Caisson
Yes you can, women often dig their nails into the testicle when in self defence scenarios which is likely to increase the likelihood of testicle rupture.
In late 180BC , Ancestors use this in killing animals for their food and for self defence
John Hines, Wright Patterson AFB, Daton Ohio
It was invented by a company called Northrop Grumman. Northrop Grumman is a company that invents aerospace and defence technology for multiple countries.
John Harrison, the English watchmaker. He was rewarded by an act of parliament as this was in a sense, a Defence) contract useful to the Navy.
Chinci Digneous Clapper! (chin-chi, dig-knee-ous, clapper)
Because they needed something other than hands, to drill rock and dig coal.
They are Military Defence, Civil Defence, Economic Defence, Social Defence and Phschological Defence.