I have a retaining wall, sorta. It acts as a divider between homes rather than retain anything. Built the same way as one, with 6x6 boards, spikes, all that jazz. No deadmen, of course.

I need to take it apart and down while keeping the boards intact (I am going to reuse them in furniture).

I tried just putting a bar between two and prying them apart but after a lot of work I got them separated by about 1/4". There's too many to do that way.

Update:

I'll try the sawzall approach this weekend and come back. Thanks for the suggestions!