Should be two cables. Pull on one and the tank could spin around in the mud and not go anywhere and worse one cable would have too much stress and snap.
The guys would be pitching in, literally, throwing in wood, blankets and straw for the the tank to get traction. Or better yet those cleats nicely stored in the fender. Thats what they're there for. Not just snow. That along with the tow hooks, other cable and jack and the blocks on the back fender would be thrown into the mix to get the tank out. And somebody has to have a pry bar. The ubiquitous tanker tool, the tanker's bar.
As said above the broken track would at least be tied together using the "u" hooks and a rope to work them back on while pulling the tank forward.
By the way, the preferred method for self recovery is to use the "u" hooks, cable put around a log and the track. Drive forward, the log goes under the vehicle allowing it to clear the mud. That's why Russian tanks invariably have unditching logs and tow cables.