The Japanese Land War was a conflict fought between the Clam tribe and an alliance of Japanese cities between 315 and 318.
Reasons for War
The Clam tribe had incited the war. They split off of the Hill tribe in China in 273, searching for a home where they could be more aggressive. In 315 they landed in Japan and attacked.
The Japanese position is obvious - they were defending their homeland. What is interesting is that in 300 BCE, the Sican tribes bonded together to resist Carthaginian invasion. Here, the Japanese bonded together to resist Sican invasion.
Beginning of the War
The Clam tribe landed on the west coast of Japan, towards the center. By the beginning of 316, their armies captured cities in central Japan and were moving on cities around modern-day Tokyo. Japanese troops in the south attempted to gain a corridor in the middle, but the Clam defenses-at least then-were too powerful.
By the Spring of 316, the Clams launched an attack on the cities around modern-day Tokyo. The northeastern cities of Japan declared war on the Clams then, and the Clam effort went downhill from then on.
By November of 316, the Clams controlled all of the cities around modern-day Tokyo, but not for long...
The Japanese Military Wave
In December, 316, the Japanese armies organized a military strategy, in which they would constantly launch waves of thousands of soldiers at the Clams, pushing them back further and further each time.
It worked. By April, 317, the Clams were out of the cities near Tokyo. By October, 317, they were out of central Japan. In February, 318, the last Clam encampments were conquered or burned by the Japanese, and the Clams were forced to leave Japan.
When the Clams left Japan, they continued to sail east. They navigated their way to the Channel Islands in 333. There, they established the Union of Clam Casares.
Also, the Japanese united to form Gioapania in 324, but the unstable kingdom only lasted until 349.