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[Today, the state of Izumo defies public law with impunity, relentlessly stretching its talons and repeatedly deploying troops to harm the people of Goryeo and our citizens of the Great Yi Dynasty.
This nation's nature is cruel and brutal, growing increasingly ferocious. At such a time, tolerance is no longer feasible.
To quell their insolent behavior and insatiable ambition for aggression, we hereby officially declare war on Izumo and announce this edict to all.]
...
The Great Yi Dynasty's declaration of war against Izumo was spread across the world on the same day.
Three legions, totaling 150,000 troops, embarked on ships, setting sail towards Izumo.
Meanwhile, the Zhenhai Fleet had already arrived at the Tsushima Strait, patrolling in search of the Izumo Navy's main force for a decisive battle.
However, everyone on board the fleet unanimously believed that the enemy wouldn't dare to come out.
