The Sword of Allah was the title bestowed to one of Islam's greatest generals and closest companions to the prophet and the 'rightly' guided caliphs by none other than prophet Muhammad himself, Khalid ibn Walid.
In honor of his new title and taking a leaf from Muhammad's playbook, Khalid unsurprisingly managed to live up to his militant moniker during his short career as a Muslim general.
While the list of massacres carried out by the armies of Muhammad and the 'rightly' guided caliphs is long, one of the most savage and brutal is retold in Tabari's history of the invasion of Iraq in which Khalid, following the example of Muhammad to execute prisoners of war, makes a covenant with Allah to defeat Khalid's enemies and behead their entire army as an offering to Allah.
http://books.google.com/books?id=47P...0blood&f=false
The Muslims raged against them. Khalid said, "Oh God, if you deliver their shoulders to us, I will obligate myself to You not to leave anyone of them whom we can overcome until I make their canal run with their blood." Then God defeated them for the Muslims and gave their shoulders to them. Khalid then commanded his herald to proclaim to the men, "Capture! Capture! Do not kill any except he who continues to resist." As a result, the cavalry brought prisoners in droves, driving them along. Khalid had detailed certain men to cut off their head in the canal. He did that to them for a day and a night. They pursued them the next day and the day after, until they reached al-Nahrayn and the like of that distance in every direction from Ullays. And Khalid cut off their heads.
Al-Qa'qa and others like him said to Khalid, "Even if you were to kill all the population of the earth, their blood would still not run....Therefore, send water over it, so that you may fulfill your oath." Khalid had blocked the water from the canal. Now Khalid brought the water back, so that it flowed with spilled blood. Owing to this, it has been called Blood Canal to this day.
Not surprisingly, many Muslims today continue to venerate Khalid ibn Walid as a good Muslim and see his example of mass beheading, along with the passages in the Koran calling for beheading and the precedent set by the prophet in beheading his enemies, as actions to follow to this day.
Devout Muslim nations, such as Saudi Arabia, in following sharia law also continue to employ beheading (as well as crucifixion) as a public form of execution. While grizzly decapitations are carried out officially by Muslim nation-states, Muslim individuals have sought to increase their deen and take it upon themselves to emulate Islam's greatest general and last prophet.
Such individuals include late mujahideen (jihad warrior) Abu Musab Zarqawi, who made it known that he was influenced to behead captured civilian Nick Berg with a knife based on the example set by prophet Muhammad in executing an entire Jewish tribe and two prisoners of war after the battle of Badr by beheading.
And as always, some peaceful Koranic verses to accompany this thread:
8:12: When thy Lord was revealing to the angels, 'I am with you; so confirm the believers. I shall cast into the unbelievers' hearts terror; so smite above the necks, and smite every finger of them!'
9:5: Then, when the sacred months are drawn away, slay the idolaters wherever you find them, and take them, and confine them, and lie in wait for them at every place of ambush. But if they repent, and perform the prayer, and pay the alms (become Muslim), then let them go their way; God is All-forgiving, All-compassionate.