The rough, flat and barren Mackenzie country make it the perfect place for filming LOTR battle scenes. So to no surprise the biggest battle scene of the trilogy was filmed near Twizel:
The Battle of the Pelennor Fields.
We gathered some information about the Pelennor Fields from Twizel's tourist information, but sadly only found out that it is on inaccessible private land. Also the proprietor only allows visitors to access by expensive booked tours. A bit too much money for us to see a barren battle field bereft of all traces of the big fights that took place here earlier.
So without visiting the local LOTR attraction we moved on to see the much more impressive and freely accessible Aoraki (Mount Cook).