"This…" he thought, "This might work."
If he's not mistaken, Ryntum had been supplying weapons to the Duchy of Camble, which is currently fighting the Sidgean Empire.
Thanks to Ryntum's support, the Duchy of Camble mounted a fierce resistance, preventing Sidgean from achieving swift victory.
As a result, the war had dragged on far longer than the empire initially expected.
They're locked in a state where they cannot retreat or advance.
It is an embarrassing situation since they struggle to crush a tiny duchy.
While Ryntum and Sidgean had no direct contact, their involvement with the Camble made them indirect enemies.
Mark can use this issue to convince Sidgean to join their side.
The Sidgean Empire is not a country with which Ryntum can easily mess.
Aside from their long-standing hegemon in the western part of the continent, they also control the mouth of the Leviathan Sea.
This natural chokepoint was the gateway between the Leviathan Sea and the vast open ocean.