Guru Nanak Dev Ji , the first Guru of the Sikhs, was born with a Sword in his heart and soul. It was a sword which he used relentlessly against hypocrisy, cruelty and terror. With that Sword he denonced religious thugs and condemned ruthless kings and ministers as they had never been condemned before.
Guru Angad Dev Ji, the second Guru of the Sikhs, was given the Sword by Guru Nanak Dev Ji, as described by the Bards Satta and Balwand :
"Nanak placed the umbrella of sovereignty on the head of Angad. He also graced the heart of Angad with the mighty Sword (Khaddag) of divine Wisdom." (page 966 SGGSJ)
Guru Arjan Dev Ji, the fifth Guru, following the martial tradition, used military metaphors throughout his writings, which became a passionate ideal for Guru Gobind Singh. He used these military metaphors to arm his disicples with the Sword of the Spirit without which no battle can be fought.
When Guru Hargobind Sahib Ji, the 6th Sikh Guru, succeeded his father at the age of 11, he put on two Swords. The Sword of Spiritual Sovereignity (Piri) and The Sword of Political Sovereignity (Miri). He showed the Sikhs to uphold both Religious and Political freedoms, wherever they existed. Religion without political freedom and dignity was abject slavery; and politics without religion was organized barbarism.
Guru Gobind Singh Ji, the 10th Guru of the Sikhs, the great general, un-matched warrior, poet par excellence showed that the Sword was the symbol of God's Power, Justice and Saving Grace, through which He protects the virtuous and punishes the wicked.
(Guru Gobind Singh Ji, Bachiter Natak)