but fingolfin , being of other temper than feanor , and wary of the wiles of morgoth , withdrew from dor daedeloth and turned back towards mithrim , for he had heard tidings that there he should find the sons of feanor , and he desired also to have the shield of the mountains of shadow while his people rested and grew strong ; for he had seen the strength of angband , and thought not that it would fall to the sound of trumpets only .