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Last time I was digginga trench & removing old fence-post concrete, I used a big old breaker (which I managed to put through the top of my foot at one point).
I ended up hiring a couple of fellas (who must have been in their 60s ) to finish it off.
They dismissed the idea of using a breaker, and used a sledge and a 6ft iron spike, and made the concrete look like stale sponge cake.
Then they chucked it on my Agapanthus.
I'm digging out an old concreted in fence post at the moment - weapon of choice is a cold chisel & lump hammer, with a bit of stitch drilling first.
Or I was, at the weekend. Until my cold chisel broke.