Volley fire

Volley fire, as a military tactic, is (in its simplest form) the concept of having many soldiers shoot in the same direction at the same time. In practice, it often consists of having a line of soldiers all fire their weapons together at the enemy forces on command, known as "firing a volley", followed by more lines of soldiers repeating the same manoeuvre in turns. This is usually to compensate for the inaccuracy, slow rate of fire (as many early ranged weapons took a long time and much effort to reload), limited effective range and stopping power of individual weapons, which often requires a massed saturation attack to be effective. The volley fire, specifically the musketry volley technique (also known as the countermarch), requires lines of soldiers to step to the front, fire on command and then march back into a column to reload, while the next row repeats the same process. The term "volley" came from Middle French volée, substantivation of the verb voler, which in turns came from Latin volare, both meaning "to fly", referring to the pre-firearm practice of archers mass-shooting into the air to shower their enemy with arrows. While the tactic of volley fire is usually associated with Dutch military thinkers in the late 16th century, its principles have been applied to crossbow infantry since at least the Chinese Tang dynasty.

History

Crossbows

Although volley fire is most often associated with firearms, the concept of continuous and concerted rotating fire may have been practiced using crossbows since at least the Han dynasty as described in the Han-Xiongnu Wars in the Book of Han, although it was not until the Tang dynasty that detailed illustrations appeared. A memorial of 169 BC by Chao Cuo recorded in the Book of Han describes the use of rotating crossbowmen against the Xiongnu: "The use of sharp weapons with long and short handles by disciplined companies of armoured soldiers in various combinations, including the drill of crossbow men alternately advancing [to shoot] and retiring [to load]; this is something which the Huns cannot even face." During the An Lushan Rebellion the Tang general Li Guangbi successfully deployed a spear crossbow formation against the rebel cavalry forces under Shi Siming. In 756 Shi Siming raced ahead of the main army with his mounted troops to intercept Li Guangbi's Shuofang army near the town of Changshan. Li took Changshan in advance and set up his men with their backs to the town walls to prevent a sneak attack. The spearmen formed a dense defensive formation while 1,000 crossbowmen divided into four sections to provide continuous volley fire. When Shi's cavalry engaged Li's Shuofang army they were completely unable to close in on his troops and suffered heavy losses, forcing a withdrawal. The 759 AD text, Tai bai yin jing (太白陰經) by Tang military official Li Quan (李筌), contains the oldest known depiction and description of the volley fire technique. The illustration shows a rectangular crossbow countermarch formation with each circle representing one man. In the front is a line labeled "shooting crossbows" (發弩) and behind that line are rows of crossbowmen, two facing right and two facing left, and they are labeled "loading crossbows" (張弩). The commander (大將軍) is situated in the middle of the formation and to his right and left are vertical rows of drummers (鼓) who coordinate the firing and reloading procedure in procession: who loaded their weapons, stepped forward to the outer ranks, shot, and then retired to reload. According to Li Quan, "the classics say that the crossbow is fury. It is said that its noise is so powerful that it sounds like fury, and that's why they named it this way," and by using the volley fire method there is no end to the sound and fury, and the enemy is unable to approach. Here he is referring to the word for "crossbow" nu which is also a homophone for the word for fury, nu. The encyclopedic text known as the Tongdian by Du You from 801 AD also provides a description of the volley fire technique: "[Crossbow units] should be divided into teams that can concentrate their arrow shooting.… Those in the center of the formations should load [their bows] while those on the outside of the formations should shoot. They take turns, revolving and returning, so that once they've loaded they exit [i.e., proceed to the outer ranks] and once they've shot they enter [i.e., go within the formations]. In this way, the sound of the crossbow will not cease and the enemy will not harm us." While the virtues of the rotating volley fire were understood during the Tang dynasty, the Wujing Zongyao written during the Song dynasty notes that it was not utilized to its full effectiveness due to their fear of cavalry charges. The author's solution was to drill the soldiers to the point where rather than hide behind shield units upon the approach of melee infantry, they would "plant the feet like a firm mountain, and, unmoving at the front of the battle arrays, shoot thickly to the middle [of the enemy], and none among them will not fall down dead." The Song volley fire formation was described thus: "Those in the center of the formation should load while those on the outside of the formation should shoot, and when [the enemy gets] close, then they should shelter themselves with small shields [literally side shields, 旁牌], each taking turns and returning, so that those who are loading are within the formation. In this way the crossbows will not cease sounding." In addition to the Tang formation, the Song illustration also added a new label to the middle line of crossbowmen between the firing and reloading lines, known as the "advancing crossbows." Both Tang and Song manuals also made aware to the reader that "the accumulated arrows should be shot in a stream, which means that in front of them there must be no standing troops, and across [from them] no horizontal formations." The volley fire technique was used to great effect by the Song during the Jin-Song Wars. In the fall of 1131 the Jin commander Wuzhu (兀朮) invaded the Shaanxi region but was defeated by general Wu Jie (吳玠) and his younger brother Wu Lin (吳璘). The History of Song elaborates on the battle in detail:

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