Battle of Yarmouk

The Battle of the Yarmuk (also spelled Yarmouk) was a major battle between the army of the Byzantine Empire and the Muslim forces of the Rashidun Caliphate. The battle consisted of a series of engagements that lasted for six days in August 636, near the Yarmouk River, along what are now the borders of Syria–Jordan and Syria-Israel, southeast of the Sea of Galilee. The result of the battle was a complete Muslim victory that ended Byzantine rule in Syria. The Battle of the Yarmuk is regarded as one of the most decisive battles in military history, and it marked the first great wave of early Muslim conquests after the death of the Islamic prophet Muhammad, heralding the rapid advance of Islam into the then-Christian Levant.

To check the Arab advance and to recover lost territory, Emperor Heraclius had sent a massive expedition to the Levant in May 636. As the Byzantine army approached, the Arabs tactically withdrew from Syria and regrouped all their forces at the Yarmuk plains close to the Arabian Peninsula, where they were reinforced, and defeated the numerically superior Byzantine army. The battle is widely regarded to be Khalid ibn al-Walid's greatest military victory and cemented his reputation as one of the greatest tacticians and cavalry commanders in history.

Background

In 610, during the Byzantine–Sasanian War of 602–628, Heraclius became the emperor of the Byzantine Empire, after overthrowing Phocas. Meanwhile, the Sasanian Empire conquered Mesopotamia and in 611 they overran Syria and entered Anatolia, occupying Caesarea Mazaca (now Kayseri, Turkey). In 612, Heraclius managed to expel the Persians from Anatolia but was decisively defeated in 613 when he launched a major offensive in Syria against the Persians. Over the following decade, the Persians were able to conquer Palestine and Egypt. Meanwhile, Heraclius prepared for a counterattack and rebuilt his army.

In 622, Heraclius finally launched his offensive. After his overwhelming victories over the Persians and their allies in the Caucasus and Armenia, Heraclius launched a winter offensive against the Persians in Mesopotamia in 627, winning a decisive victory at the Battle of Nineveh thus threatening the Persian capital city of Ctesiphon. Discredited by the series of disasters, Khosrow II was overthrown and killed in a coup led by his son Kavadh II, who immediately sued for peace and agreed to withdraw from all occupied territories of the Byzantine Empire. Heraclius restored the True Cross to Jerusalem with a majestic ceremony in 629.

Meanwhile, there had been rapid political development in the Arabian Peninsula, where Muhammad had been preaching Islam and, by 630, had successfully annexed most of Arabia under a single political authority. When Muhammad died in June 632, Abu Bakr was chosen as caliph and his political successor. Troubles emerged soon after Abu Bakr's succession, and several Arab tribes openly revolted against Abu Bakr, who declared war against the rebels. In what became known as the Ridda wars of 632–633, Abu Bakr managed to defeat his opponents and unite Arabia under the central authority of the caliph at Medina.

Once the rebels had been subdued, Abu Bakr began a war of conquest, beginning with Iraq. Sending his most brilliant general, Khalid ibn al-Walid, Iraq was conquered in a series of successful campaigns against the Sassanid Persians. Abu Bakr's confidence grew, and once Khalid established his stronghold in Iraq, Abu Bakr issued a call to arms for the invasion of Syria in February 634. The Muslim invasion of Syria was a series of carefully planned and well-co-ordinated military operations, which employed strategy, instead of pure strength, to deal with the Byzantine defensive measures.

The Muslim armies, however, soon proved to be too small to handle the Byzantine response, and their commanders called for reinforcements. Khalid was sent by Abu Bakr from Iraq to Syria with reinforcements and to lead the invasion. In July, the Byzantines were decisively defeated at Ajnadayn. Damascus fell in September, followed by the Battle of Fahl in which the last significant garrison of Palestine was defeated and routed.

After Abu Bakr died in 634, his successor, Umar, was determined to continue the Caliphate's expansion deeper into Syria. Though previous campaigns led by Khalid had been successful, he was replaced by Abu Ubaidah. Having secured southern Palestine, Muslim forces now advanced up the trade route, and Tiberias and Baalbek fell without much struggle and conquered Emesa early in 636. The Muslims then continued their conquest across the Levant.

Byzantine counterattack

Having seized Emesa, the Muslims were just a march away from Aleppo, a Byzantine stronghold, and Antioch, where Heraclius resided. Seriously alarmed by the series of setbacks, Heraclius prepared for a counterattack to reacquire the lost regions. In 635 Yazdegerd III, the Emperor of Persia, sought an alliance with the Byzantine Emperor. Heraclius married off his daughter (according to traditions, his granddaughter) Manyanh to Yazdegerd III, to cement the alliance. While Heraclius prepared for a major offensive in the Levant, Yazdegerd was to mount a simultaneous counterattack in Iraq, in what was meant to be a well-coordinated effort. When Heraclius launched his offensive in May 636, Yazdegerd could not co-ordinate with the maneuver, probably owing to the exhausted condition of his government, and what would have been a decisive plan missed the mark.

Byzantine preparations began in late 635 and by May 636 Heraclius had a large force concentrated at Antioch in Northern Syria. The assembled Byzantine army contingents consisted of Slavs, Franks, Georgians, Armenians and Christian Arabs and Lombards, Avars, Khazars, Balkans, Göktürks. The force was organized into five armies, the joint leader of which was Theodore Trithyrius. Vahan, an Armenian and the former garrison commander of Emesa, was made the overall field commander, and had under his command a purely Armenian army. Buccinator (Qanatir), a Slavic prince, commanded the Slavs and Jabalah ibn al-Aiham, king of the Ghassanid Arabs, commanded an exclusively Christian Arab force. The remaining contingents, all European, were placed under Gregory and Dairjan. Heraclius himself supervised the operation from Antioch. Byzantine sources mention Niketas, son of the Persian general Shahrbaraz, among the commanders, but it is not certain which army he commanded.

The Rashidun army was then split into four groups: one under Amr in Palestine, one under Shurahbil in Jordan, one under Yazid in the Damascus- Caesarea region and the last one under Abu Ubaidah along with Khalid at Emesa.

As the Muslim forces were geographically divided, Heraclius sought to exploit that situation and planned to attack. He did not wish to engage in a single pitched battle but rather to employ central position and fight the enemy in detail by concentrating large forces against each of the Muslim corps before they could consolidate their troops. By forcing the Muslims to retreat, or by destroying Muslim forces separately, he would fulfil his strategy of recapturing lost territory. Reinforcements were sent to Caesarea under Heraclius' son Constantine III, probably to tie down Yazid's forces, which were besieging the town. The Byzantine imperial army moved out from Antioch and Northern Syria in the middle of June 636.

The Byzantine imperial army was to operate under the following plan:
* Jabalah's lightly armed Christian Arabs would march to Emesa from Aleppo via Hama and hold the main Muslim army at Emesa.
* Dairjan would make a flanking movement between the coast and Aleppo's road and approach Emesa from the west, striking at the Muslims' left flank while they were being held frontally by Jabalah.
* Gregory would strike the Muslims' right flank, approaching Emesa from the northeast via Mesopotamia.
* Qanatir would march along the coastal route and occupy Beirut, from where he was to attack the weakly defended Damascus from the west to cut off the main Muslim army at Emesa.
* Vahan's corps would act as a reserve and would approach Emesa via Hama.

Rashidun strategy

The Muslims discovered Heraclius' preparations at Shaizar from Byzantine prisoners. Alert to the possibility of being caught with separated forces that could be destroyed, Khalid called a council of war and advised Abu Ubaidah to pull the troops back from Palestine and Northern and Central Syria and concentrate the entire Rashidun army in one place. Abu Ubaidah ordered the concentration of troops in the vast plain near Jabiyah, as control of the area made cavalry charges possible and facilitated the arrival of reinforcements from Umar, so that a strong, united force could be fielded against the Byzantine armies. The position also benefited from close proximity to the Rashidun stronghold of Najd, if retreat became necessary. Instructions were also issued to return jizya (tribute) to people who had paid it.

However, once concentrated at Jabiyah, the Muslims were subject to raids from pro-Byzantine Ghassanid forces. Encamping in the region was also precarious as a strong Byzantine force was garrisoned in Caeseara and could attack the Muslim rear while they were held in front by the Byzantine army. On Khalid's advice the Muslim forces retreated to Dara’ah (or Dara) and Dayr Ayyub, covering the gap between the Yarmuk Gorges and the Harra lava plains, and established a line of camps in the eastern part of the plain of Yarmuk. This was a strong defensive position, and the maneuverers brought the Muslims and Byzantines into a decisive battle, which the latter had tried to avoid. During the maneuvers, there were no engagements except for a minor skirmish between Khalid's elite light cavalry and the Byzantine advance guard.

Battlefield

The battlefield lies in the plain of Jordanian Hauran, just southeast of the Golan Heights, an upland region currently on the frontier between Jordan and Syria, east of the Sea of Galilee. The battle was fought on the plain south of Yarmuk River. That ravine joins the Yarmuk River, a tributary of the Jordan River, on its south. The stream had very steep banks, ranging from – in height. On the north is the Jabiyah road and to the east are the Azra hills although the hills were outside the actual field of battle. Strategically, there was only one prominence in the battlefield: a elevation known as ''Tel al Jumm'a'', and for the Muslim troops concentrated there, the hill gave a good view of the plain of Yarmuk. The ravine on the west of the battlefield was accessible at a few places in 636 AD, and had one main crossing: a Roman bridge (''Jisr-ur-Ruqqad'') near ''Ain Dhakar'' Logistically, the Yarmuk plain had enough water supplies and pastures to sustain both armies. The plain was excellent for cavalry maneuvers.

Troop deployment

Most early accounts place the size of the Muslim forces between 36,000 and 40,000 and the number of Byzantine forces between 60,000 and 70,000 (This number has been estimated by taking into account the logistical situation of the Empire and with the view that they could never have mustered such troops when the Empire was at its apex but especially not with the especially weak and exhausted realm of 628 onwards). Modern estimates for the sizes of the respective armies vary: some estimates for the Byzantine army are between 80,000 and 150,000, while other estimates are 15,000 to 20,000. Estimates for the Rashidun army are between 25,000 and 40,000. Original accounts are mostly from Arab sources, generally agreeing that the Byzantine army and their allies outnumbered the Muslim Arabs by a 2 to 1. The only early Byzantine source is Theophanes, who wrote a century later. Accounts of the battle vary, some stating it lasted a day, others more than a day.

Rashidun army

During a council of war, the command of the Muslim army was transferred to Khalid by Abu Ubaidah, Commander in Chief of the Muslim army.
After taking command, Khalid reorganized the army into 36 infantry regiments and four cavalry regiments, with his cavalry elite, the mobile guard, held in reserve. The army was organised in the ''Tabi'a'' formation, a tight, defensive infantry formation.
The army was lined up on a front of , facing west, with its left flank lying south on the Yarmuk River a mile before the ravines of ''Wadi al Allan'' began. The army's right flank was on the Jabiyah road in the north across the heights of ''Tel al Jumm'a'', with substantial gaps between the divisions so that their frontage would match that of the Byzantine battle line at . The centre of the army was under the command of Abu Ubaidah ibn al-Jarrah (left centre) and Shurahbil bin Hasana (right centre). The left wing was under the command of Yazid and the right wing was under Amr ibn al-A's.

The centre, left and right wings were given cavalry regiments, to be used as a reserve for a counterattack if they were pushed back by the Byzantines. Behind the centre stood the mobile guard under the personal command of Khalid. If Khalid was too occupied in leading the general army, Dharar ibn al-Azwar would command the mobile guard. Over the course of the battle, Khalid would repeatedly make critical and decisive use of that mounted reserve.

Khalid sent out several scouts to keep the Byzantines under observation. In late July, Vahan sent Jabalah with his lightly armoured Christian-Arab forces to reconnoitre-in-force, but they were repulsed by the mobile guard. After the skirmish, no engagement occurred for a month.

Weaponry

Helmets used included gilded helmets similar to the silver helmets of the Sassanid empire. Mail was commonly used to protect the face, neck, and cheeks as an aventail from the helmet or as a mail coif. Heavy leather sandals, as well as Roman-type sandal boots, were also typical of the early Muslim soldiers. Armour included hardened leather scale or lamellar armour and mail armour. Infantry soldiers were more heavily armoured than horsemen. Large wooden or wickerwork shields were used. Long-shafted spears were used, with infantry spears being long and cavalry spears being up to long. Short infantry swords like the Roman gladius and Sassanid long swords were used; long swords were usually carried by horsemen. Swords were hung in baldrics. Bows were about long when unbraced, similar in size to the famous English longbow. The maximum useful range of the traditional Arabian bow was about . Early Muslim archers, while being infantry archers without the mobility of horseback archer regiments, proved to be very effective in defending against light and unarmoured cavalry attacks.

Byzantine army

A few days after the Muslims encamped at the Yarmuk plain, the Byzantine army, preceded by the lightly armed Ghassanids of Jabalah, moved forward and established strongly fortified camps just north of the Wadi-ur-Ruqqad.

The right flank of the Byzantine army was at the south end of the plains, near the Yarmuk River and about a mile before the ravines of ''Wadi al Allan'' began. The left flank of the Byzantines was at the north, a short distance before the Hills of Jabiyah began, and was relatively exposed. Vahan deployed the Imperial Army facing east, with a front about long, as he was trying to cover the whole area between the Yarmuk gorge in the south and the Roman road to Egypt in the north, and substantial gaps had been left between the Byzantine divisions. The right wing was commanded by Gregory and the left by Qanatir. The centre was formed by the army of Dairjan and the Armenian army of Vahan, both under the overall command of Dairjan. The Byzantine regular heavy cavalry, the cataphract, was distributed equally among the four armies, each army deploying its infantry at the forefront and its cavalry as a reserve in the rear. Vahan deployed Jabalah's Christian Arabs, mounted on horses and camels, as a skirmishing force, screening the main army until its arrival.

Early Muslim sources mention that the army of Gregory had used chains to link together its foot soldiers, who had all taken an oath of death. The chains were in 10-man lengths as a proof of unshakeable courage on the part of the men, who thus displayed their willingness to die where they stood and not to retreat. The chains also acted as an insurance against a breakthrough by enemy cavalry. However, modern historians suggest that the Byzantines adopted the Graeco-Roman testudo military formation in which soldiers would stand shoulder-to-shoulder with shields held high and an arrangement of 10 to 20 men would be completely shielded on all sides from missile fire, each soldier providing cover for an adjoining companion.

Weaponry

The Byzantine cavalry was armed with a long sword, known as the ''spathion''. They would also have had a light wooden lance, known as a ''kontarion'' and a bow (''toxarion'') with forty arrows in a quiver, hung from a saddle or from the belt. Heavy infantry, known as ''skoutatoi'', had a short sword and a short spear. The lightly armed Byzantine troops and the archers carried a small shield, a bow hung from the shoulder across the back and a quiver of arrows. Cavalry armour consisted of a hauberk with a mail coif and a helmet with a pendant: a throat-guard lined with fabric and having a fringe and cheek piece. Infantry was similarly equipped with a hauberk, a helmet and leg armour. Light lamellar and scale armour

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