Denmark, my ally has about 10k soldiers sitting in Poland from a recently finished war who can't get back because they somehow don't have the exile modifier and Pomerania hates Denmark and controls all the land between Poland and Denmark. Denmark is involved in another war with the Livonian order. My army is theoretically superior to the Livonians except in numbers because 15% defensive+5% Protestant moral bonus gives me the advantage, and I have tech ten so I have the Schwartze Reiter while Livonia still has the much inferior Latin Knights and my general has 2 shock. Why can't Denmark come and help me defend Denmark's own lands? Denmark is instead brilliantly using their fleet- including the transports- to blockade Livonia.