There is some conflicting information on this topic.
According to World Guide page 75 (sidebar) "4690 AR The Gorilla King of the city of Usaro in the Mwangi Expanse, Ruthazek, attacks Alkenstar and seizes the Gunworks’ largest bombard as a trophy."
According to page 86-87 (sidebar) of the World Guide, however "4684 AR The Gorilla King of Usaro sends an army through tunnels beneath the Shattered Range mountains to attack Alkenstar. His forces make off with a number of firearms and the Gunworks’ biggest bombard as a trophy. After years of attacks against Sargava’s colonizers, the child-god Walkena sacks Kalabuto for the first time."
So, did the attack happen in 4690 or in 4684? Did the attack take 6 years? I looked at the Mwangi Expanse guide, but it makes no mention of this attack (as far as I could find).
I looked at some earlier sources, according to Inner Sea World guide
(page 37), "4690 Gorilla King Ruthazek attacks Alkenstar and seizes the Gunworks’ largest bombard as a trophy." and
(page 111) "And while many of Alkenstar’s leaders worry about Geb or Nex attempting to annex their duchy, to date the only significant attacks on the fledgling nation from beyond its borders have come from the west in the form of raids by strange giants or attacks by the charau-ka armies of the Gorilla King. These latter conflicts came to a head in 4690, when the Gorilla King led his armies through a series of tunnels under the Shattered Range to make a surprise attack on Alkenstar. The Grand Duchy attempted to use its largest weapon against the Gorilla King—an experimental bombard. But when the bombard misfired, it fell into the Gorilla King’s clutches, and while Alkenstar’s army managed to finally defeat and drive off the Gorilla King and collapse the tunnels to the Mwangi Expanse, they lost more than just their pride."
