Yes and no. Getting shot is terrifying to you, but the other army isn't shooting to terrify you, but to incapacitate you and your colleagues to reach some (strategical) goal. The terror is just a happy side effect. On the other hand, armies could also use acts of terror to reach some goal. For example, instead of just taking soldiers prisoner of war, you could just cut off their heads and put them on a stake at the front. Or raping all the women in the occupied territory (although that could also be a way to 'lay claim to the land and people' by creating a generation of mixed bloods, I suppose. In that case, it wouldn't be an act of terror, although everyone on the receiving end would be plenty of terrified)