Flag of Switzerland used by Burgundy and Maximilian I. The first flag used as a field sign representing the confederacy rather than the individual cantons may have been used in the Battle of Arbedo in 1422 (notably without the participation of the Canton of Schwyz). This was a triangular red flag with an elongated white cross. The white cross was thus in origin a field mark attached to combatants for identification, and later also to cantonal flags. The Lucerne chronicle of 1513, in battle scenes of the Burgundy wars of the 1470s shows cantonal flags with an added white cross. In this context,
Flag of Switzerland squares until 1889, when its dimensions were officially set. The civil and state ensign of Switzerland, used by Swiss ships, boats and non-governmental bodies, is rectangular in shape and has the more common proportions of 3:2. The Swiss flag is one of only two square sovereign-state flags, the other being the flag of Vatican City. The emblem of the Red Cross is the Swiss flag with switched colours. According to the 2017 flag law (SR 232.21), "The Swiss flag shows a Swiss cross on a square background". Special provisions are made for the naval ensign and for civil aircraft identification.