This was a tedious and long war! It all started with one Skeleton King and his 4 Generals. The King started spawning Necromancers, which started walking in all directions, raising more undeads and creating new piles of skeletons who raided the whole island.
For those who like statistics:
12 hours for the first skeletons to be noticed
1.5 day for the King to be found
2.5 days for the King to be killed
14 days for the last Necromancer to get killed
-Peak number reached (total skeletons): 9838 skeletons -Peak number reached (piles): 976 piles -Peak number reached (necromancers): 246 necros