Use Oil. They already established they got it. Why not start a nice big fire.
The
Black Water or
Flaming Water is a mistranslation or misinterpreted into English. The Korean Word is
Fire-Water, this word is base of the element of the Magic Stone/Monster Core that is harvested from the monster core from the desert.
Yeah, burn the carts. Them having so much wood to make that many carts is kinda unrealistic anyway. xD They're in a freakin' desert.
Also how can they move the carts so quickly and surround their enemies when they're on foot? Screams GM Bullshit to me.
The webtoon illustration did not properly shown how the Wickli Tribe keep repairing damage or destroyed equipments.
The webtoon also haven't show that Yulian's faction repeated destroying of the equipment is rapidly declining the enemies resources for those repairs.
All this is information from the novel.
I have reread this again from the beginning and also pointed this out in the past, in the translators sites like mangacow, merikiscans and more.
So this whole fight is extremely costly on both side. But all I can say is that it was the author over exaggeration of the battle events, that make this battle illogical as the story develop as if the battle did not remove or decrease their combat capacity.
I remember reading this in the novel and thinking why is this fight not ended yet and it should have ended after the few days of stalemates and draws. Instead the fight keep continuing as if both side have unlimited resources and combat power.