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The double-envelopment, or pincer movement, is such a tried and true military tactic that the guy who literally wrote the book on war, Sun Tzu, discussed it in his book. It involves, as the name suggests, outflanking an enemy on both sides in order to encircle it completely. Sun Tzu actually argued against employing this tactic, because if carried through to completion it leaves the enemy no opportunity to retreat, and he believed that an enemy with its back against the proverbial wall like that would fight harder than one whose fighters saw a chance to flee.
That’s not bad reasoning, but with all due respect to Sun Tzu we should note that some of history’s greatest massacres have been visited upon armies that were completely enveloped by their enemies. There are problems involved in attempting a pincer movement, including complexity and the vulnerability of your army’s center, which has to engage the enemy and hold out while the flanks do all their flanking maneuvers, but in several major engagements in which it’s been successfully implemented–Hannibal at Cannae in 216 BCE, the Seljuks at Manzikert in 1071, Daniel Morgan at Cowpens in 1781–the army using the pincer has won with heavy casualties on the other side (the Romans lost well over 50,000 men at Cannae, for example which would be a major loss of life nowadays and was a massive number for a battle at that time).
It’s likely that no army has ever made more use (or at least more famous use) of the pincer movement than the Mongolian army, or I guess the several Mongolian armies because there were usually many of them out campaigning at any one time. They used a variant of the pincer movement that (Sun Tzu would approve) generally didn’t envelope the enemy from the rear and thus left them a way out if they could get back the way they’d come. They also, usually, didn’t anchor the fighting with the center of their line while their flanks maneuvered around the enemy position. Instead, the Mongol forces, primarily made up of highly maneuverable mounted archers, would “retreat” at the center in order to get the enemy army, or at least part of it, to chase them and basically envelop itself. This is an incredibly difficult tactic to pull off, mostly because a feigned retreat–which has to look like a chaotic flight to pull off the deception–can turn very easily into a real retreat if you’re not careful. But the Mongols were experts at it.
This helpful visual representation of a feigned retreat comes from here, where you can see representations of a couple of other favorite Mongol tactics as well
I note the Battle of Legnica’s anniversary today not because it was a huge or even particularly important battle, but because it gives me a chance to write all that stuff about the pincer movement. The fact that it wasn’t a particularly significant battle means I could talk about the whole feigned retreat thing without this post becoming some 2000 word monstrosity (hey, stay tuned for this evening’s conflict updates!), so that’s convenient I guess.
Legnica (or Liegnitz for you German speakers out there) was the culmination of the first Mongol “invasion” of Poland, which wasn’t really much of an invasion in the sense of being an attempt to take and hold territory. It was more of an extended raid intended as a diversion. There was a large Mongolian invasion of Europe happening at the time, but it was centered on Hungary, which had recently welcomed a large number of Turkic Cumans who were sick of being defeated by the Mongols in Central Asia and Eastern Europe.
Two large Mongolian armies–one under Genghis Khan’s grandson Batu (d. 1255) and the other under the legendary Mongolian general Subutai (d. 1248)–chased the Cumans into Hungary in late-1240/early-1241, while a third, considerably smaller army under another of Genghis Khan’s grandsons, Orda (d. 1251), raided Poland. This third force probably numbered less than 10,000 at the start of its campaign, and would have been smaller than that by the time of Legnica due to casualties suffered along the way.
In late March 1241, Orda learned that the High Duke of Poland, Henry II (d. 1241, spoiler alert), had gathered an army at Legnica and was waiting for the arrival of a much larger army, commanded by Wenceslaus I of Bohemia (d. 1253). Orda decided to strike Henry before the two armies could link up, at which point they would’ve vastly outnumbered the Mongols. The rest of the story you should already have figured out by now–the Mongols engaged Henry’s army, feigned a retreat, Henry chased them, and they closed the trap. Nearly Henry’s entire army seems to have been killed, including Henry himself (he was apparently captured and beheaded, which is curiously mundane considering the inventive ways we’re told that the Mongols usually executed captured royal enemies).
Orda, still concerned about facing a Bohemian army that on its own outnumbered his small force, opted to leave Poland after the battle. He headed south to join Batu and Subutai, and by the time he met up with them they’d already defeated the Hungarian army at Mohi on April 11. Despite these two victories, this was pretty much the end of this particular Mongol incursion into Europe. The Great Khan, Ögedei, died in 1241, and Batu took a significant part of his army back east in order to participate in the succession process and make sure his interests were protected. Because of Mongolian dynastic politics, which we have no reason to talk about here, he didn’t return west for over a decade, at which point “the Mongol Empire” was really four separate empires with only nominal allegiance to a single Great Khan in the east. Batu and his family, who were descendants of Genghis Khan’s eldest son (well, it’s debatable that he actually was Genghis Khan’s son, but whatever) Jochi, ruled the “Golden Horde” Khanate, see below:
But that’s all digression. This 1240-1241 invasion stalled because Batu had to return east for the succession, but the Mongols were also running out of able-bodied soldiers, were starting to see revolts break out in parts of Eastern Europe that they had previously conquered, and were without adequate pasture for their horses in the central European climate. That climate, as well as its large number of castles and the consequent emphasis on siege warfare, made Europe tough country for the Mongols to conquer moving forward. It’s also entirely possible that they had no intention of going any further at this point, in 1241, than they’d already gone.