On 5 December 1918, there was a protest and an armed clash fought by the National Guards established as an armed force of the National Council of the State of Slovenes, Croats and Serbs supported by Sokol volunteers, on one side, against the soldiers of the 25th Regiment of the Royal Croatian Home Guard and the 53rd Regiment of the former Austro-Hungarian Common Army. It took place on 5 December 1918, four days after proclamation the Kingdom of Serbs, Croats and Slovenes, when the soldiers were stopped by the National Guardsmen at the Ban Jelačić Square in Zagreb.