never underestimate mud you don't want to get into a situation like this where you need a tow truck to get un-stuck. it probably did not look muddy at first .(I know this thread is old but this could be useful information)
This is not me, but this counts as badly stuck. This Huddig backhoe sunk past the bottom of the frame and needed a big :censored: tow truck to pull it out. I don't think using the backhoe or the front bucket would have helped in this case. This is what I call stuck