Roman Army Tactics: Tiberius's Siege of Andreatium Tiberius's siege of Andreatium, which took place in 20 BCE, is a prime example of Roman military tactics and strategies during the imperial period. The campaign aimed to subdue the recalcitrant tribes in the region, particularly the Breuci. Tiberius, demonstrating tactical ingenuity, employed a combination of siege warfare techniques and psychological tactics to weaken the resistance of the fortified town. The Roman army surrounded Andreatium, c