Ranged/Siege Promotion "Accuracy I" and Melee/Mounted/Armor Promotion "Shock I" are different in original game, but now their effect are both "+[15]% Strength in [Open terrain]"
In original game, "Accuracy I" is:
if our Ranged/Siege unit attacks the enemy unit which is in Open terrain, our Ranged/Siege unit +[15]% Strength
Compare with "Accuracy I", "Shock I" is:
if our Melee/Mounted/Armor unit is in Open terrain, and then it attacks the enemy unit, our Melee/Mounted/Armor unit +[15]% Strength