First line unit
Building phase: place into 1st line, without placed into reserve zone and use in same turn
Howitzers and Mortars can hits to selected units on 1st opponent's line. Hit power equals supporting bonuces, which Howitzer or Mortar gains usually attacking units. After hit Howitzer or Mortar tapped and gains no damage
Any opponent's unit, which attack and not be blocked, destroyed Artillery spotter and can continued attack to the 2nd line