July 637
The Sassanid government attacks a rebel stronghold in Central Persia with nearly 100,000 men taking part in the battle. The battle lasts for 12 days without either side securing a decisive victory, the government eventually broke off when their supplies began to run low and 10,000 more rebels arrived. Casualties were heavy, with both sides having over 20,000 dead. The rebels were unable to follow up on the government's withdrawal because of their own high casualties.
The Caliphate continues to whittle away at independent tribes in the Arabian Peninsula, bringing more of the region under their control and stabilizing their homeland.
A land dispute between farmers in the Byzantine Theme of Kartli and Abkhazia leads to a skirmish where the Thematic soldiers quickly seize the disputed land. The territory was only 40 acres, but the effectiveness of the Thematic army was shown for the first time.
August 637
The Bulgarians capture Theodoro and ransack the city, very few of the Gothic citizens remained after the slaughter. With the fall of the city the Gothic Kingdom collapsed and Bulgaria took over its possessions.
Violence breaks out in Somalia after Copts protest paying the Jizya tax. During the crackdown on the demonstration a dozen Coptic nobles were arrested and 1,000 Coptic civilians were killed. The Kingdom of Axum sends a complaint over the situation to the Caliphate.
The Tang dynasty in China enters the Tarim Basin, taking it from the Göktürkish Khaganate with amazing efficiency. The Chinese begin expanding the Great Wall to their new territory. They also open diplomatic talks with the Kangar Khanate about tribute.
The rebel armies in Persia begin marching toward Ctesiphon. The government prepares an ambush near the Mesopotamian border. The rebels hear about this and split up and avoid the trap, marching into Mesopotamia unmolested.
A third of the Byzantine Themes are fully functional. These Themes are: Carthage, Naples, Venezia, Constantinople, Alexandria, Cherson, Palestine, Syria, Armenia, and Kartli. The rest of the Themes were still organizing the government around the Strategos and distributing land amongst the soldiers.
September 637
Conflict breaks out between a Muslim and a Zoroastrian tribe in the north Arabian Peninsula over the theft of a camel.
In response to the Axumite complaint, the Caliphate invades an Axumite trading partner and levies an unusually large jizya tax on the Copts in their realm. The Axumites counter by establishing a league of Coptic tribes and kingdoms, called the Coptic League, in a defensive alliance against the Caliphate. The League sent representatives to the Byzantine Empire to try to gain support. Heraclius denied the Empire's formal entry into the League, but pledged military assistance if attacked by the Caliphate. The Basileus also sent a warning to the Caliph to stop the unequal treatment of the Coptic Christians, or the Treaty of Damascus would be considered forfeit.
The Bulgarians storm into Cherson and begin sieging the capital of the Theme, Cherson. The Strategos rallies his army in Theodosia and prepares to send the Bulgarians back, but first sends word to nearby Strategoi and Heraclius.
The Kangar Khanate and Tang dynasty reach an agreement:
- The Kangar will protect Chinese merchants on the Silk Road.
- The Kangar will send military assistance when called upon.
- The Kangar Khanate will pay the Tang 10,000 gold coins as tribute.
- The Tang will recognize the Kangar Khanate’s possessions.
- The Tang will allow free trade in the Tarim Basin with the Kangar Khanate.
- Both parties agree to a non-aggression pact.
October 637
Thematic armies from Pontus and Moesia arrive in Theodosia, the combined armies march toward Cherson to drive out the Bulgarians. For a week, skirmishes occurred to the East and North of Cherson, with the Bulgarians being steadily pushed backward closer to the city, which was now being reinforced from the sea courtesy of Heraclius himself. On the third week of the campaign, the Bulgarian supply lines were cut off and the Byzantines cornered the Bulgarians between Cherson and their army. The Bulgarians soon began to feel the strain of the lack of supply and many soldiers surrendered to the Byzantines. On the fifth week of the campaign the last Bulgarians surrendered. Of the 30,000 Bulgarians that invaded the Theme of Cherson only 15,000 came back, 8,000 were killed, and 7,000 were captured. Not only did the Bulgarians lose half their army, they also lost their newly won possessions in Crimea. The Bulgarians sued for an official peace.
The Sassanid government army that had been preparing to ambush the rebel army began a hasty march toward Ctesiphon to save it from the approaching rebel armies. The Southern rebel army surrounded Uballa and other nearby cities and put them under siege. The Northern rebel army continued to press into Mesopotamia and approached Ctesiphon.