Vanguardism, a core concept of Leninism, is the idea that a revolutionary vanguard party, composed of the most conscious and disciplined workers, must lead the proletariat in overthrowing capitalism and establishing socialism, ultimately progressing to communism.
The vanguard works to engage the working class in revolutionary politics and to strengthen proletarian political power against the bourgeoisie.
Skirmishers are light infantry or light cavalry soldiers deployed as a vanguard, flank guard or rearguard to screen a tactical position or a larger body of friendly troops from enemy advances. They may be deployed in a skirmish line, an irregular open formation that is much more spread out in depth and in breadth than a traditional line formation. Their purpose is to harass the enemy by engaging them in only light or sporadic combat to delay their movement, disrupt their attack, or weaken their morale. Such tactics are collectively called skirmishing. An engagement with only light, relatively indecisive combat is sometimes called a skirmish even if heavier troops are sometimes involved.
Skirmishers can be either regular army units that are temporarily detached to perform skirmishing or specialty units that were specifically armed and trained for such low-level irregular warfare tactics. Light infantry, light cavalry (historically), and irregular units often specialize in skirmishing. Skirmishers' open formations and smaller numbers can give them superior mobility over the regular forces, allowing them to engage only on favorable terms, taking advantage of better position or terrain, and quickly withdrawing from any threat of superior enemy forces. Though often critical in protecting the main army from sudden enemy advances, skirmishers were historically poor at taking or defending ground from heavy infantry or heavy cavalry.
Quintus Herennius Etruscus Messius Decius (died c. June 251), known simply as Herennius Etruscus, was briefly Roman emperor in 251, ruling jointly under his father Decius. His father was proclaimed emperor by his troops in September 249 while in Pannonia and Moesia, in opposition to Philip. Decius defeated Philip in battle, and was then proclaimed emperor by the Senate. Etruscus, still a child, was elevated to Caesar (heir) in 250, then further raised to Augustus (emperor) in May 251. When the Goths, under Cniva, invaded the Danubian provinces, he was sent with a vanguard, followed by the main body of Roman troops, led by Decius. They ambushed Cniva at the Battle of Nicopolis ad Istrum in 250, routing him, before being ambushed and routed themselves at the Battle of Beroe. Etruscus was killed in the Battle of Abritus the following year, alongside his father. After the deaths of both emperors, Trebonianus Gallus, who had been governor of Moesia, was elected emperor by the remaining Roman forces.
The Battle of Patay, fought on 18 June 1429 during the Hundred Years' War, was the culmination of the Loire Campaign between the French and English in north-central France. In this engagement, the horsemen of the French vanguard inflicted heavy casualties on an English army; most of them sustained by the longbowmen as the English cavalry fled. In addition, all but one of the senior English commanders were captured. A victory often credited to Joan of Arc, she was in fact not present for the battle as she had remained with the main body of the French army. The vanguard at Patay was led by La Hire and Jean Poton de Xaintrailles.
The battle was a disastrous blow to English aspirations in France. For the French, it cemented the turn of fortune which had begun at Orléans and concluded a highly successful campaign. The latter was followed by a march to Reims which saw the Dauphin Charles crowned King of France. The Hundred Years' War, however, would continue until 1453.
In the arts and literature, the term avant-garde (from French meaning 'advance guard' or 'vanguard') identifies an experimental genre or work of art, and the artist who created it, which usually is aesthetically innovative, whilst initially being ideologically unacceptable to the artistic establishment of the time. The military metaphor of an advance guard identifies the artists and writers whose innovations in style, form, and subject-matter challenge the artistic and aesthetic validity of the established forms of art and the literary traditions of their time; thus, the artists who created the anti-novel and surrealism were ahead of their times.
As a stratum of the intelligentsia of a society, avant-garde artists promote progressive and radical politics and advocate for societal reform with and through works of art. In the essay "The Artist, the Scientist, and the Industrialist" (1825), Benjamin Olinde Rodrigues's political usage of vanguard identified the moral obligation of artists to "serve as [the] avant-garde" of the people, because "the power of the arts is, indeed, the most immediate and fastest way" to realise social, political, and economic reforms.