A bunch of scouts in the austrian army were doing their thing, riding on horseback to guard against turkish invasion. They spot a bunch of gypsy's with a lot of homemade liquor and decided to get as shitfaced as possible before anyone noticed they were gone.
They were partying for hours, and when the infintry was sent to find them, the higher ups assuming turks might have gotten to them, they find them partying it up with the gypsys, and naturally ask for a taste of that **** as well. The scouts refused, and an argument ensued, and one of the drunken scouts trying to draw his pistol shot himself in the foot.
Now, this was during a time of tense war between austria and turkey in another part of the world, things were pretty much like east and west berlin. So when part of the infantry heard a gunshot who weren't close enough to see what was going on, they assumed a turkish army was coming their way. They saw a bunch of people in the distance, their own guys, and assumed they were turkish soliders, firing at the scouting riders and infantry with a volley. Now everyone was losing their ****, infantry was shooting at infantry, drunken scouts were running over people on horseback screaming about turkish raiders, and to make matters worse, half the army didn't speak austrian but german instead, so when the german officers shouted halt, the panic'd soliders heard allah instead, and ran screaming and firing in all directions back to the camp.
The camp, which by that time had gotten to bed, woke up with the sound of explosives, gunshots, and people screaming of an invading army, came out to see a bunch of bullet stricken scouts riding for their lives, and promptly paniced and ordered a cannon volley on their own camp and countryside from the nearby towns garrison. Then everyone ran away from the area, and it took until morning of panicing and fortification to realize the turks hadn't even been at the area, let alone tried to launch a full scale war.