Digging/drilling fence post into rubble

[nrg710]

I need to set a good few 4x4 fence posts into the ground to create a 6ft fence. So I have 8ft fence posts that I intend to sink 2ft into the ground.

Problem is that the ground is basically rubble. Almost impossible to dig using a conventional trench spade & clamshell tool. And from what I know of augers, they wouldn't touch this either.

So the question is- What's the best way of making a 2ft deep hole into rubble?

 

[blup]

Pneumatic drill, fencing grabs (post hole digger) and good knee pads

 

[scbk]

Pinch bar.

Bulldog BCB72CP 72" x 1 1/8 Chisel and Point Crowbar

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If you want to splash the cash there's various "jack hammers", but it can be a bit of a slippery slope once you start looking at longer chisels, anti vibration etc