 Complete the following phrase:  Hunnic armies relied on their high mobility and a shrewd sense of when to attack and when to withdraw. An important strategy used by the Huns was a feigned retreatpretending to flee and then turning and attacking the disordered enemy. This is mentioned by the writers Zosimus and Agathias. They were, however, not always effective in pitched battle, suffering defeat at Toulouse in 439, barely winning at the Battle of the Utus in 447, likely losing or stalemating at the 