What name did William Foster & Company of Lincoln give to their first prototype military tank of 1915?

WaldoLydeker, The maker's name was William do it may have been that. And it was British:-D Just used American part.

I've got a couple of dictionaries of slang and they both date, "before 1905", the use of "willie" to refer to the male member. So was the nickname for the tank, which of course shoots big-time, deliberately picked as a play on words, like an oxymoron? Large, corpulent men sometimes nicknamed "little" as Little John, Robin Hood's bud. Maybe.

JezzerLX, It's British.