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Testudo formation in the game is basically broken because it has 100% ranged block chance from all angles, so you can shoot at one unit with 19 units of archers and it would do nothing. I read somewhere that a patch resolved this by lowering the maximum range block chance to something more reasonable. Was this in a patch or mod?
Edit: In previous games such as RTW1, RTW2, and Attila, testudo formations were not formations that had 100% missile block from all (4) angles. In the older games, ranged fire could still wear down the formation and wound soldiers even when shooting it from the front. The sides of the testudo formation was also weaker and the rear of the testudo formation was very weak, so shooting a testudo formation from the sides and rear caused more and more casualties.
This meant that the AI and good players had to flank testudo formations with their ranged units to shoot them from more vulnerable side and rear angles - this encourages a larger variety of gameplay tactics compared to the current 3K testudo formation that is totally invulnerable from all sides and makes flanking useless.