It does make sens to use more than one, if you fight on a large area. keep them far from missile though! in general i use 2 scary units in ambush... in the heat of battle when moral is depleted on both side, i spring those fear units... in general, the ennemy rout... one at each end of the battle line... plus a xtrong center as i don't know if those in the center are affected by the ''fear radius''.

And for my older post, yeah, I tought Vartan was speaking about those who'd think it's cheating to use flamming arrows... it's my mistake, sorry!