(See also: Timeline)
There were already Turf Wars dating back to 2,000 years before the current setting, perhaps either as a competitive sport or a method to settle conflicts. However, as these Turf Wars of nineteen centuries later involved the Inklings and Octarians (instead of just teams of four Inklings), it has expanded into a bigger campaign, great enough to become a historical event.Before the Great Turf Wars, the Inklings and Octarians had "amicable relations", until the rising sea levels caused them to lash out against each other in a power struggle over the remaining land. In the second year of this conflict, the first Squidbeak Splatoon was formed by Cap'n Cuttlefish, who recruited two other Inklings and Ammoses Shellendorf (Sheldon's grandfather) as its members.
The Octarians took victory over the Inklings in their first battles, due to the Inkling's inability to wake up early enough to defend themselves against the Octarians' Great Octoweapons. The Octarians had all but sealed the Inkling's fates when a plug was carelessly pulled out, causing the Great Octoweapons to fail. Without these essential weapons at the Octarians' disposal, they were quickly defeated by the Inklings, which appeared to be due to their superior number of tentacles.
Aftermath and legacy
After the Octarians were defeated, they were forced to move underground where they connected their territory through a series of kettles. This was later known as Octo Valley.