You order the soldiers to seal the pit themselves with local rocks.
3
It's a hard thing to do.
967 AD, Few days later
3
They force a small avalanche! A dozen or so soldiers dies under the weight of snow and rocks.
967 AD, And few days after that
4
But the rocks and boulders are steadily rolled down into the tunnel.
967 AD, Two weeks after the battle
6
And then finally, one morning, by a stroke of luck, few rolling stones cause a rockslide that rolls right into the tunnel, bringing tons of material down the pit. Once the dust settles, the tunnel is blocked, and only few wisps of smoke rise from within.
You hold a council with your senior and your officers, and conclude the campaign.
Congratulations! Estwalf successfully concludes the Second campaign to Repel the Lizardmen of the Depths!
As you leave the vicinity of mountains, and the moment to split ways with King Tinwulf grows near, you hear some chatting of your officers, and speak to them.
They think that you should thank King Tinwulf II for assistance in one way or another.
A) Indeed! Time to invite our glorious senior to Tven capital, where there will be a military parade and feast to celebrate the joint victory!
B) Thank him? We've been supplying him with stuff for years now, it's about time he left his home country and supported us instead!
C) Indeed! We will send a small tribute of coin to Dahnia next year.