In a small bowl mix together the au jus mix and brown gravy mix.
Place the roast inside the slow cooker crock.
Sprinkle half of the mix over the top and gently rub into the beef.
Flip the roast over, sprinkle with the remaining mix and rub into the beef.
Pour in the water around the sides of the crock.
Cook on low for 8 hours or high for 6 hours.
Remove roast and place on a large plate or cutting board.
Cut away and discard any fat.
Using two forks, pull apart the beef.
Place the shredded beef back into the au jus and keep on warm until ready to serve.
When ready to serve, lightly toast cut baguette slices in a pan over medium heat.
Place a good helping of beef onto the bottom toasted baguette and spread out to the sides with a fork.
Lay two slices of cheese over the beef and then place the top toasted baguette on top, pressing down gently.
Once all beef is removed from the slow cooker you should be left with plenty of au jus broth to serve along side your sandwiches.
Ladle au jus into a small bowl and serve warm with sandwiches.