The wood discovered in the walls showed a construction period ranging from 50 BC to 125 AD: it was the time when Augustus wanted to annex to his Roman Empire the short-lived province of Germania.

The most significant military contribution of this emperor was the development of the Limes Germanicus, which encompassed a vast network of roads, forts and watchtowers constructed along the Rhine River to defend the Empire.

Although little information survives of the battles fought, enough early victories were apparently achieved for Domitian to be back in Rome by the end of 83 AD, where he celebrated an elaborate triumph and conferred upon himself the title of Germanicus.

[6] The archaeologists estimate the castrum had the size needed for at least one Roman legion (with about 5,000 legionaries) together with auxiliary troops: a total of about 8,000 to 9,000 men could have used it.

Indeed Maximinus Thrax (the first Roman "soldier-emperor" who reigned briefly from 235 to 238 AD) was personally involved in operations against the Germanic tribes in the recently discovered battle site at Harzhorn and he raided the area around Hachelbich.