I'm not gonna quote everything now as I am in school and have like 10 minutes left before my class ends, but i just want to touch on the "they never tried to conquer it again part".
I don't see how you missed these parts but meh:
Marcus Aurelius campaigned extensively in the massive Marcomannic Wars during the 160’s-170’s A.D., and planned the annexation of Sarmatia and Marcomannia as imperial provinces.
As late as the early third century Caracalla conducted a massive campaign in the Agri Decumates and in Germania Magna against the Alammani that involved a large-scale concentration of troops, and was accompanied by widespread construction of colonial outposts, and by a major extension of Roman garrisons and fortifications across the Rhine and Danube rivers.
Maximinus Thrax also conducted large scale operations in Germany, and even planned the annexation of the entirety of Magna Germania.
Significantly, evidence found on the Kalefeld battlefield indicates the Roman forces were marching from a north-eastern direction, indicating even deeper advances.
I don't see how you missed these parts but meh:
Marcus Aurelius campaigned extensively in the massive Marcomannic Wars during the 160’s-170’s A.D., and planned the annexation of Sarmatia and Marcomannia as imperial provinces.
As late as the early third century Caracalla conducted a massive campaign in the Agri Decumates and in Germania Magna against the Alammani that involved a large-scale concentration of troops, and was accompanied by widespread construction of colonial outposts, and by a major extension of Roman garrisons and fortifications across the Rhine and Danube rivers.
Maximinus Thrax also conducted large scale operations in Germany, and even planned the annexation of the entirety of Magna Germania.
Significantly, evidence found on the Kalefeld battlefield indicates the Roman forces were marching from a north-eastern direction, indicating even deeper advances.