Protests begin across Syria, reaching Aleppo in April.
Protests take place at Aleppo University. The security services crack down on the protests, and four students are killed.
Large protests at the university are overrun by security services and pro-government crowds.
The first battles break out in Aleppo city, with gunfights in Salaheddine district.
The armed uprising reaches Aleppo in earnest, when between 6-7,000 fighters from 18 battalions, mostly from the countryside of Aleppo province, take up arms against the government in the city.
Flights from Aleppo international airport are suspended due to the conflict.
110 bodies are discovered in the Aleppo river, apparently having floated downstream. They appear to have been executed; most had gone missing at government checkpoints.
Opposition forces capture the Umayyad mosque in Aleppo.
Opposition forces enforce a siege of government-held west Aleppo
The first barrel-bomb attack on Aleppo is reported.
The fitna begins. It is a battle between the opposition forces and ISIS, to expel ISIS from Aleppo. ISIS retreats from Idlib and Aleppo and consolidates in the east of the country. A front line between the opposition forces and ISIS was held through the Aleppo countryside from this point on.
18 January onward
Barrel-bomb attacks on Aleppo continue with multiple attacks each month throughout 2014 and 2015.
Opposition forces tunnel under the Old City and plant a bomb underneath the Carlton hotel, a base for government forces.
A war of attrition continues throughout 2015, with the city of Aleppo split in two.
Barrel bombings continue throughout the year, and many attacks occur every month.
September—Russian forces join the conflict in earnest.
A nationwide cessation of hostilities is announced and the ceasefire begins across Syria.
Putin announces his troops are pulling out of Syria. They do not.
After a six-week pause during the cessation of hostilities, barrel-bomb attacks begin again in Aleppo.
Syrian Arab Army (SAA) and allies begin the “north Aleppo” offensive to take Castello Road, the last supply line into east Aleppo.
A seventy-two-hour “period of calm” for the celebration of Eid is implemented, but fighting in the Castello Road area continues throughout as the government continues its offensive.
SAA and allies take back control of the Castello Road, cutting access to opposition-held east Aleppo.
Opposition forces mount an offensive and take control of Ramousah Road, creating a tentative access road into east Aleppo, though it is heavily shelled and besieges government-held west Aleppo in the process.
Darayya (Damascus) is evacuated after a “truce” agreement is agreed between local representatives and the government.
SAA and their allies take back control of Ramousah Road, besieging east Aleppo.
A nationwide ceasefire, negotiated between Russia and the US, begins for an initial period of forty-eight hours.
The nationwide ceasefire is extended for another forty-eight hours.
US jets hit SAA forces near Deir Ezzour; they announce the strike was accidental.
Russian or Syrian jets hit an 18-truck aid convoy in the west Aleppo countryside, signaling the end of the ceasefire.
SAA and allied forces launch an offensive to take back Aleppo, and retake 15–20 percent of the opposition-held part of Aleppo.
Opposition forces launch the "Battle of the Hero Martyr Abu Omar Saraqib" in west Aleppo, trying to break the siege, but fail.
Syrian forces take control of Hanano suburb in east Aleppo.
Russia and China veto a UNSC resolution calling for a humanitarian pause in Aleppo.
Only 5 percent of the original territory the opposition occupied in the city remains in their hands, and a ceasefire is announced.
An evacuation is set to begin, but the buses are halted at the final checkpoint by an Iranian militia.
The evacuation begins.
The evacuation continues but is stalled when government-aligned militias force evacuees off the bus and send them back to east Aleppo. A new evacuation deal is negotiated, incorporating evacuations from Foua and Kafraya.
Evacuation buses near Foua and Kafraya are burned by JFS, halting reconfigured evacuation deal.
ICRC announces the evacuation of Aleppo complete, while the Syrian government declares victory.