He described the French using crude 1-foot (0.30 m) plug bayonets during the Thirty Years' War (1618–1648). The first known mention of the use of bayonets in European warfare was in the memoirs of Jacques de Chastenet, Vicomte de Puységur. This naturally prevented the gun from being fired. The bayonet had a round handle that slid directly into the musket barrel. This allowed light infantry to be converted to heavy infantry and hold off cavalry charges. Įarly bayonets were of the "plug" type, where the bayonet was fitted directly into the barrel of the musket. It was labelled as a "gun-blade" (traditional Chinese: 銃刀 simplified Chinese: 铳刀) with it being described as a "short sword that can be inserted into the barrel and secured by twisting it slightly" that it is to be used "when the battle have depleted both gunpowder and bullets as well as fighting against bandits, when forces are closing into melee or encountering an ambush" and if one "cannot load the gun within the time it takes to cover two bu (3.2 meters) of ground they are to attach the bayonet and hold it like a spear". It was in the form of the Son-and-mother gun, a breech-loading musket that was issued with a roughly 57.6 cm (22.7 in) long plug bayonet, giving it an overall length of 1.92 m (6 ft 4 in) with the bayonet attached. The first recorded instance of a bayonet proper is found in the Chinese military treatise Binglu published in 1606.