As you can see, we had to decide how to best cut it, because it was in a rather precarious position. We decided, after reviewing what we know about physics, gravity, levers and see-saws, that we could cut it pretty safely at the fence line. Being that it was wedged pretty well between the two alders, and against a fir on the other side, we figured when it was cut there's only so far it could go. It would go straight up, or down... depending on which end was heavier.
We cut through it with a combination of sawsall and handsaw.
We cut through it till it was just hanging on by a hair, then ecurbh just pushed on it till it broke loose.
Here's the video of that exciting moment!
And here's where it now sits... it's clear of the fence now, and stable there... The fence sprang back into place, not terribly stretched. The horses can at least be turned back out there.
So yeah - we had to push it. :~)