The "Myth" of the "Dacian Falx" as a super weapon

[diegis]

Quite right on both counts, Nina! Tapae was the site of several battles precisely because it was a 'bottleneck' - a pass through the mountains. Its physical size precludes any 'large battle', let alone deployment of the "biggest army ever used against a foreign enemy" ( which seems to have been divided into several different invasion forces coming from different directions, not just all invading via Tapae/Iron gates.)

Roman army in first war had just 2 columns, who meet and join right before the battle of Tapae. And that was the bulk of Roman army, since after the battle of Tapae (an inconlusive Roman victory) when Dacians counteratacked in Moesia, Traian himslef with a part of this army retreated and rush there to resolve the problem, meaning that he left behind in Moesia just a small force with guarding duties.