The orcs were waiting for this moment of chaos desperately and weren't actually as lazy and careless as they seemed.
In fact the majority of them had their armor and weapons in hand, their lines formed in what seemed like and instant and just as the orcs were gearing up to take the city once and for all something fell from the sky.
It was a massive boulder that instantly crushed dozens and dozens of orcs that were in battle formations, but that was not all, great amounts of oil spilled out of the boulders.
These weren't natural boulders as they were clearly perfectly round, conjured by earth mages and hollowed from the inside.
Soon, fire rained from the sky and ignited a terrible storm of fire that consumed the lives of thousands of orcs. The smoke blinded the orcs and caused their breathing to become harder and harder reducing their effectiveness.