How does the the Unite the Land objective work or become invoked. I recently played game 2147716 and lost to Colonel Dysonsphere because he took all the castles. The reason for his win was given as "The Unite the Land objective". The armies remaining against him numbered many hundreds.
I am currently playing game 2229939 and have occupied most of the land including all castles and villages, but have not been given a win. Why is that?