James George Frazer,
The Belief in Immortality and the Worship of the Dead…
“ In the battle the priest used to distort his face into a variety of frightful grimaces and to utter appalling yells, which were supposed to proceed from the god whom he bore or attended. But the national war-god was not the only deity whose image was borne to battle. Other chiefs of rank had their war-gods carried near them by their priests; and if the king or chief was killed or taken, the god himself was usually captured also. The presence of their deities inspired the warriors with courage; for they imagined the divine influence to be essential to victory. ”
