Scout Bombs are used as a quick method of attacking
(They are the fastest Unit in the game)
Depending on the Troop count in the defending city your Scouts will Generally hit Archers or Ballista First.
Scout Bombs are effective because they are cheap and very Quick to rebuild
(Tip! Invest in Scouts)
This "Scout Bomb" has attacked the highest combined attack unit, hence the large amount of Ballista lost in this Report.