The Millers beat the Martyrs 3-0 in last summer's encounter at Stoke Lane and so can expect a tough encounter when the teams meet in the return fixture tomorrow.
A group of Carlton fans made the trip to Wales yesterday and more are heading down this afternoon.
Merthyr Town have a commemoration event taking place at 1pm before the game and after the match their is entertainment in the form of singer Scott Pritchard. All in all it looks to be a cracking weekend in store.
For those Millers supporters unable to make the trip, there will be regular updates from the game on the @CarltonFans twitter feed.