If you want to do it properly, you get a bloke with a steam ploughing engine to draw it out like a rotting molar, standing well back as he screws down the Salter safety valve for added effort...
At the risk of saying me too. I had to pull some of the bigger stumps of leylandii with the Landrover, reverse gear and low box to put tension on then chop the roots as they surfaced then trailered the debris to the coup.