The unforgettable night of between October 1-2 in 1944. But first a little background since i doubt people are that well aware of the related events...
This event is part of the Lapland War. Which is the third war Finland fought during the WW II. It was required by the allies (i.e. the Soviets) that Finns had to expel Germans from Finland. German attempt to take Suursaari (Gogland) island from Finns was the first notable event. However that alone didn't change much since up in the north neither Finns or Germans were particularly keen on fighting.
Germans basically just wanted to ferry all their material away and then go back fighting the Soviets and Finns, well, just wanted the Germans to go. So the two parties came to an understanding - which is called the 'autumn maneuvers'. Where parties mutually agreed on a timetable: Germans blew up roads and bridges and withdraw - Finns fired some arty at now empty German positions and advanced. Which worked great until Soviets learned of that and required more aggressive chase - while interestingly also simultaneously requiring Finland to demobilize.
Now Finns had a dilemma. Germans didn't want to (or couldn't really) withdraw any faster and Finns had to be aggressive. So something had to be done. Finns had managed to insert a single battalion (Battalion Pennanen, after its commander) to outer port of Kemi, the island of Ajos (see attached map). So the idea was to load some men (a regiment or so) to some ships (civilian tramps) and sail them without any escorts or air cover past the Germans and make a diversion by capturing Kemi. Which was - to put it kindly - a rather bold plan. To make it worse Germans were perfectly aware of the plan so General HQ order it to be shelved. However General commanding Finnish forces on the region decided to tweak it a bit and run it without telling General HQ anything. So the plan was changed to land to Röyttä, the outer port of Tornio. End result shocked every one. Finnish local commanders that it worked, Finnish high command as well as Germans and Soviets that it actually happened.
So back to magic night...
Town of Tornio is somewhat peculiar in a sense since the main part of the town is located on an island in the Swedish side of the Tornio river but it is connected to the Finnish side by a bridge (OTOH, you could just walk to Sweden there - it is an 'island' in a sense that once upon a time a stream separated it from Sweden - not so much any more). In the time period in question the Germans had constructed a supply base on the Finnish side of the river. This 'little Berlin' as they were known as filled materials (generally of non-military sort) that German troops needed, supplies, food. And fair share of alcohol.
As was said the Finnish landing was a shock to Germans. Add to this the distraction caused by the small Finnish uprising in the own of Tornio and you ought to see that Germans we not in any way prepared to handle the Finnish landing. Finns had additionally managed to requisition (a polite term) a train to ferry troops straight from the outer port to the Finnish side of the river facing the town. So while Germans had practically no troops in the region Finns had a while regiment (with another one in tow) and functional train to swiftly move them preventing the roads to the port from being congested.
Just as it seemed that everything was going exactly along the Finnish plan something happened. Finnish troops found the German liquor stock. What followed is - as they say - history. Or what exactly did any one expect when you mix troops fresh from fighting the Soviets, who had not been relieved and demobilized, sent to fight a war they have no interest of fighting, together with trainloads (literally) of alcohol?
First battalion to enter the scene was swiftly out of the count. As was its sister battalion, all along with its CO. Who by the way in his drunken stupor forgot that he had sent some bicycle mounted infantry to flank the enemy (that part didn't end so well). Message swiftly reached the town on the other side of the river too and soon all sort of things were happening. People were ferrying booze on everything that had wheels on them (light anti-tank guns were apparently especially good for this). According to some information a small amount of Germans actually joined the Finns in the drinking fest (despite of just previously shooting each other) during the magical night of Tornio when the war (which had barely begun) halted. Sort of like the WWI football match. But with booze
Finnish efforts to untangle the mess were not particularly successful since the second regiment sent to contain the drunken escapades of the first regiment had to be contained too
. It actually took few days for the military operations on the Finnish side to resume - untangling the mess took some time but then again so took recovering from the hangover as well. So instead of nice quick victory Finns had to actually fight the Germans who used the operational pause on the Finnish side quite effectively to muster forces to oppose the Finns. Finnish efforts were further hampered by the badly organized support of the landing - leaders wanted more men to Tornio which meant that as it happened the Finns had indeed plenty of men in Tornio, just no armor or artillery which put kind of a cramp to operations. Add to this the German attacks against the tramp freighters with Ju87s and even Hs 293 glide bomb carrying Condors.