Fort Solgales

Fort Solgales (ソルがレス砦, Sorugaresu Toride) was a fortress located about seven miles northwest of Bernia. The Holy Knight, Gilthunder resided at and governed over the fort before its destruction.

Plot
Gilthunder, after hearing the report of a child a child having pulled his sword, which he had used to seal Bernia's river's underground water source, borrowed a spear from one of the guards and threw it directly at Bernia, in order to confirm whether this was an accident or not himself. Meliodas stopped the spear and threw it back, which led to the fort's destruction and Gilthunder's realization of the seven Deadly Sins still being alive.