The Banu Nalir and the Battle of Urd

Musa ibn Iqaba says it was the Banu Nalir who was helping the Quraysh in the battle of Urd so this is very recent, it's fresh. How did they help them by guide, by telling them where to camp and what to do, right? So they know the lay of the land, the QuraysH don't know the layof the land so the BanuNalir becomes the guide of the Quraysh. Now yet another point that is adding to the whole tension with Banu NAlir,. The entire incident of Qab Ibn Ashraf, remember Qab ibn Ashraf, right? Half Arab, half Yeh