I have started a new 1861 campaign, is it correct to asume that all new units are filled by replacements, or do they fill automatically or time. how long does it take to fill all the vacancies in a regt. etc etc? What influences the speed?
if you recruit new units they need some time to be ready for action. You don't need replacements for that. The time till a unit is ready is indicated in the unit-tooltip. This time depends of the type of unit.