As is known, Quriesh witnessed the happening of the Elephant when Abraha and his Army intended to destroy the Ka'bah. But Allah sent Birds, and made the army like field of broken grass. The Quriesh have made poetry on this happening, and some use these poems to know what happened. Is this right? what if it is used along side with the Authentic Ahadith of the Prophet on this Happening? what have scholars said on using these poetry, which is probably weaker than the weak Ahadith?
That would need to be inspected whatever poetry that is.
In general if anything in it contradicts with what quran and sunnah/ahadees tells us, than that thing will be rejected. Otherwise it can be trusted to some extant, this incident was not long before the Prophet Muhammad PBUH was born. Thats why quran says "haven't you seen what your lord did with the people with elephants."