That'd be a huge over-generalisation. It doesn't help that the term "good general fighters" is quite nebulous--is it supposed to mean people with merely good individual fighting skills, or competent soldiers with a balance between group and individual skills, or something else entirely?Interesting. So to train them to fight in formation like that is probably a similar amount of time to train them to simply be good general fighters?
The best we can say is that a minimal-but-adequate level of proficiency in both individual fighting and formation tactics could be achieved in just a few months of intensive practice, but this will be far from the end of the soldier's training since, this way, most of that "training" will be on-the-job with a rather high attrition rate from both combat and noncombat losses.
It's not that strange, really. World War I trench raiders sometimes wore steel breastplates to protect themselves from fragments and hand-to-hand weapons. Soviet combat engineers in World War II also made use of pistol-proof (or nearly so) steel cuirasses in urban fighting. And of course, while the solid ballistic plate inserts provided to 21st-century infantry in the most industrialized nations are more often made of ceramics rather than metal, they nevertheless represent a large-scale return of solid-plate armour to the battlefield.It would be... strange if solid metal armor came back in use amongst infantry.
