As we all know, the Franco-Prussian war was like WWI’s grandfather. It was one of the first instances of a ‘machine gun’ of sorts, and the Prussian’s had amazing artillery. However, I have not been able to find information regarding the little details of the war.
Question one: What kind of infantry tactics were used? Did they fight in a line formation, or was it more like guerrilla warfare? How large would the lines typically be if they were implemented? Would they try to use cover, or would they be forced to stand in the open? How often was cavalry used, and when would the infantry come in? Was artillery used WWI style, where they would use it to soften up the enemy for attack, or would it be used as more of a support/long distance role?
And question two: Role-specific firearms. What weapons (eg. revolvers) would officers be issued? Did either side make use of snipers, and if so, would they be given a special long distance rifle, or would they be given a standard-issue rifle with a scope?
Sorry about the godawful formatting, and if you could provide a source for your answer so I could read more about it, that would be greatly appreciated, however it is not necessary. If you could also make a sort of ‘example battle map’ for better understanding of the tactics that would also be great! Have a wonderful day!
This answer from a now deleted user looks like it answers your questions relating to tactics.
One thing to note is that sniping wasn't a normal role we'd expect to see during this era, even with specialist troops. Long-range fire was more a tool of general infantry, who would fire in volleys at extended ranges against area targets (like other enemy formations). The French in particular held the advantage here, with their Chassepot rifles being effective out to 1,200 meters. Specialist weapons, meanwhile, were generally limited to variations of the infantry rifles and were almost exclusively carbines. These often amounted to almost identical guns with minor differences between them, their main functional differences being the shorter effective range due to their shorter barrels. The French, for example, issued Cavalry and Gendarmarie carbines that 27.4 inch barrels instead of the 31.7 inch on the Infantry rifle, with sights limited to 1,000m. Between the variants, the big difference was the presence of a bayonet lug on the Gendarmarie rifle. There was also the Artillery Musketoon, which had a 20-inch barrel, bayonet lug, and sights out to 1,200m.
I'm not as familiar with the specifics of the Prussian guns of the war, but the trend was likely very similar - "specialist" weapons would be either those issued to cavalry and dragoons/mounted infantry or those given to troops like artillery who needed guns for self-defense but were never intended to be actively fighting using them.