Pull the trigger.

Scrolling the drum to put the cartridge in the firing position at the level of a special notch.

Insert the cartridge into the chamber of the drum so that the pin is directed to the side, scrolling to the next chamber.

Make a shot, then cock the trigger and put the next round in firing position.

When all cartridges have been fired, pull the trigger and use a ramrod to free the drum from spent cartridges.

Kindly look at the video of the Lefaucheux Revolver Scale 1:4 in action