Kind of reminds me of something from China's Three Kingdoms time: Cao Cao had the largest navel fleet ever built at the time, but only had 2 experience naval admirals, he ended up executing both when an enemy officer planted a fake note making it look like they were secretly spies, then one of the enemy officers who was a skilled admiral pretended to defect to Cao Cao's side, since he was the only one with note worthy navel skills he was put in charge of the navel fleet, when the fleet set sail the waters were choppy and there was a lot of wind that time of year so the officer convinced Cao Cao to chain the ships together to stabilize them, at which point another navel officer pretended to defect the night before the battle began except instead he set his ship on fire when he got close and rammed it into Cao Cao's fleet, because of the wind and because of the ships being chained together almost the entire fleet burned over night and what was left of Cao Cao and his men were forced to flee before sun rise.