Two castra were established: the "Altstadtkastell" between Miltenberg and Kleinheubach (2.7 hectares) to the north and the "Kastell Miltenberg-Ost" in the direction of Bürgstadt (0.6 hectares). The former, which was likely built some years in advance of the overall change in the borderline, housed a cohort, the southernmost military presence on the Main. In 190/1, this was the "cohort I Sequanorum et Rauricorum equitata" (a mixed infantry and cavalry unit of 480 men). In addition, a scout unit ("exploratores Triputienses") was based in the area, either in the "Altstadtkastell" or in a nearby separate fort. The cohort castrum likely was continuously occupied until about 260, when the Romans abandoned this part of their border after heavy raids by Germanic tribes. The castrum was destroyed by the Alemanni.