Ether 9:12

and there began to be a war between the sons of Akish and Akish, which lasted for the space of many years; yea, unto the destruction of nearly all the people of the kingdom; yea, even all, save it were thirty souls, and they which fled with the house of Omer;

A war started between Akish’s sons and Akish. It lasted many years. Almost all the people in the kingdom were killed. Only thirty people were left, plus those who ran away with Omer’s family.

Civil war broke out between Akish and his sons. It dragged on for years and nearly wiped out the entire kingdom. Only about thirty people survived, along with those who had fled with Omer’s household.