If they can't lift it out with another Chinook then recovering it would be tricky but not impossible. Build temporary road (probably wooden) across field, bring in crane and low-loader, detach rotors, lift fuselage onto low-loader, close roads and off you go - having previously found route without low bridges, removed overhead phone lines, removed traffic islands, etc etc. It's been done from time to time, eg
RAF Blocks Village To Move Chinook Chopper (that was at Odiham but I think this one is from Benson) - as noted in the story there's a specialist unit that does this work, the Joint Aircraft Recovery and Transport Squadron.