A sawzall (reciprocating saw) is the best for working around dirt, with either a woodcutting blade or a branch cutting blade. I've cut out roots through the dirt and all with a battery powered one. I tried it one time with my chainsaw, and that was the last. It's like if it even sniffs the dirt it's instant dullsville.
I've used my s10 blazer with a hefty rope tied to the ball on the trailer hitch for pulling. One time I snapped a 3/8" rope and it sounded like an m80. I've used it to shake a large walnut tree one year when we had a bumper crop, had the rope tied off about 30 feet up, and actually felt the back end jump to the left a few inches when I gave it just a bit too gas, lol.
Anyway, sounds like fun, lol, good luck and hope your arm is okay!