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You decide that the other 'world' is best left alone and the entrance simply guarded, this way you can control orcish incursions and possibly keep Ironbone Mountains safe forever. Dispatches are sent to the mountainous garrisons, to establish a perimeter around the cave.
Next is the diplomat from Tetan I.
The diplomat goes on that your Army officers seem to not realize whom they're fighting with. While the tactic of bombardment horses is sound one against few hundred auxiliaries, the rate of Fireblood machines' fire is not that useful against thousands upon thousands of fast-moving, fighting-and-retreating, backstabbing and circling horse nomads. Furthermore, they refuse to adopt the Eldrican approach of fielding cavalry units to counter the initial charges, instead preferring to find a defensive terrain and weather the assaults there.
"My master, Tetan I's finds your army's arrogance and superiority complex unacceptable for the goal of mutual military cooperation. He asks that you control your troops more definitely, otherwise he sees no real advantage in continuing the cooperative military endeavour." Your courtiers murmur; the officers and your sons, especially Iwald, believe that its Eldricans who are simply too arrogant to accept the superiority of well-honed and professional Methiantese.
A) "Fine then, my soldiers will be going home, thank you very much!"
B) "It is King Tetan who is wrong. Tell him that, and ask him to order his officers to listen to the superior experience and knowledge of my professional officers."
C) "Seems that it was my Army officers who were wrong after all. You can assure your King that I will send orders to my soldiers, asking them to listen to their Eldrican counterparts."
D) "I will send one of my military sons to better coordinate our forces and foster unity between our peoples!"