Retreating German forces utilized scorched earth tactics, and though initially German General Lothar Rendulic ordered only the public buildings in Rovaniemi to be destroyed, on 13 October 1944 the German army received orders to destroy all the buildings in Rovaniemi, only excluding hospitals and houses where inhabitants were present. While the German rear guard was going about the destruction, an ammunition train in Rovaniemi station exploded and set fire to the wooden houses of the town. The German troops suffered many casualties, mainly from glass splinters. A Finnish commando unit claimed to have blown up the ammunition train and may well have been the primary cause of the town's ruin. The cause was then unknown and generally assumed to be the deliberate intent of Rendulic. During these hostilities 90% of all the buildings in Rovaniemi were destroyed.