It requires 3 separate legions spread across a location to completely block the way through that location. Parrius did not have any such a formation left anywhere along our route. You lie, as usual, when you claim that there were any Parrian troops taken out by Rangers. Learn how troop movement works before you go spouting off about what is and isn't possible.
Written by my hand on the 29th of Hindyear, in the year 1147.