The Mutiny of Aran:
The first widely reported battle of the Grand War, despite attempts to censor it, the Mutiny of Aran kicked off in the town of Aran when the invading Second division refused to attack and formed an unsanctioned truce with the Primary defenders.
Both sides refused orders from higher-ups to fight, and in fact turned on their own artillery units and officers who attempted to re-initiate hostilities.
 
How did the mutiny end? What consequences did this have for both sides of the war? How did the Second and Primary governments adjust their war doctrine to address the greatly increased threat of defections and rebellions? Did anyone win the war in the end, or did both countries destabilise?