The Timeline

630 Two years before Muhammad's death of a fever, he launches the Tabuk Crusades, in which he led 30,000 jihadists against the Byzantine Christians. He had heard a report that a huge army had amassed to attack Arabia, but the report turned out to be a false rumor. The Byzantine army never materialized. He turned around and went home, but not before extracting 'agreements' from northern tribes. They could enjoy the 'privilege' of living under Islamic 'protection' (read: not be attacked by Islam), if they paid a tax (jizya).

This tax sets the stage for Muhammad's and the later Caliphs' policies. If the attacked city or region did not want to convert to Islam, then they paid a jizya tax. If they converted, then they paid a zakat tax. Either way, money flowed back to the Islamic treasury in Arabia or to the local Muslim governor.

632—634 Under the Caliphate of Abu Bakr the Muslim Crusaders reconquer and sometimes conquer for the first time the polytheists of Arabia. These Arab polytheists had to convert to Islam or die. They did not have the choice of remaining in their faith and paying a tax. Islam does not allow for religious freedom.

633 The Muslim Crusaders, led by Khalid al—Walid, a superior but bloodthirsty military commander, whom Muhammad nicknamed the Sword of Allah for his ferocity in battle (Tabari, 8:158 / 1616—17), conquer the city of Ullays along the Euphrates River (in today's Iraq). Khalid captures and beheads so many that a nearby canal, into which the blood flowed, was called Blood Canal (Tabari 11:24 / 2034—35).