Well now, Wilhelm, you've been a very naughty boy this year. You'll be happy to know that your militia were captured, not killed. You'll be sad to know that your unwarranted attack on my coast guard means that I won't be returning Greenland. I also wish to ask if any of Germany's neighbors had trouble with his ships attacking them in shared territorial waters, because I don't believe for a moment that this was an accident.
Full story: My coast guard was attacked while patrolling near my east coast, no where near Greenland's 12 NM border, when a small fleet of German ships attacked them. This was interpreted by my generals as a prelude to an invasion, and we launched a counter attack to sink his local navy and disable his supply ports. Their navy turned tail and ran, taking some lovely damage as they went, and our men landed at Greenland. We found that the militia stationed there were engaged in putting down a revolt, and were ill prepared for the determined brought against them. As they're not capable of independence given their limited economic capabilities, we've worked out a temporary agreement with them as a vassal state until a more permanent solution is decided. (They're determinedly communist, but they do realize the limitations of their situation and are willing to work towards a middle ground.)
In summary, I can only conclude that Ody had planned a 'diplomatic accident' (as there were only two militia units in the region beyond his fleet), and my generals misinterpreted it as a full attack.