Quote Originally Posted by Sniper-T
hammer and chisel?? How about a rockdrill, and a spade bit breaker... drill a grid work of holes, split them with the spade, you'll create a whackload of 'bricks', that you can use as walls or outside 'ramparts. you'll also accomplish much more... much quicker than with a hammer/chisel. A battery powered 'multi-tool', would be an awesome addition to your kit!
Indeed. Do you have imagery, or, better still, a recommendation of manufacturer, for these items?

Chuckle... I'd had thoughts of drilling holes and sticking in the business end of a old fashioned manual hydraulic PortaPower (precursor to the Jaws of Life) and ratcheting away. Must be careful, though, cave-in is not my idea on how to finish.