A less than glorious moment in US military history. On this day in 1776, US troops from Massachusetts and Pennsylvania fought each other at Fort Ticonderoga. Alcohol was involved.
1776 ‘Christmas Riot’ At Fort Ticonderoga Reveals Long-Forgotten Tensions

There were class differences, cultural clashes, and escalating rivalries between officers. There was also a lot of boredom and alcohol. On Christmas night, a Pennsylvania colonel named Thomas Craig appears to have led a sudden vicious attack.

Dozens of Pennsylvania soldiers followed him, raiding the Massachusetts encampment, shouting threats against the “Damn Yankees” and threatening murder. Keagle found one officer’s account that described Pennsylvania soldiers “armed with guns, bayonets and swords, [who] by force entered the tents and huts of [Massachusetts] officers and soldiers, dragging many out of doors naked and wounding them, robbing and plundering.”

Apparently no one died and senior officers soon restored order.