The day before, soak the casings in cold water.
Trim the meats, removing any small bones, cartilage, and sinew, then cut into strips for easier grinding. Keep the pieces well chilled.
In a bowl, combine the salt, pepper, caraway (or cumin), sugar, saltpeter, coriander, nutmeg, and pressed or powdered garlic. Pour the wine into a separate glass and set both aside.
Using a 4.5 mm grinder plate, grind the meats into a tub, alternating beef and pork.
Sprinkle the spice mix over the ground meat and knead vigorously until evenly combined. Pour in the wine last and mix again until the mixture is uniform and slightly tacky.
Load the mixture into a sausage stuffer, pressing firmly to eliminate air pockets.
Stuff the casings smoothly yet firmly, then twist or tie into 20 cm links.
After stuffing, cut the links in pairs and hang them to air-dry for two days before smoking.
On smoking day, transfer the sausages to a cold smoker with a light airflow and smoke for 8 hours.
The following day, lay the gendarmes flat between two boards and press for 24 hours to create their characteristic slightly square profile.