The Dandi March, or Salt Satyagraha, began on March 12, 1930, from the Sabarmati Ashram in Ahmedabad and ended on April 6, 1930 at Dandi in Gujarat, as a non-violent protest against the British salt tax. 

Here's a more detailed explanation:

Background:

Before the 1882 Salt Act, Indians could make salt from seawater without restriction. The British imposed the act, giving them a monopoly over salt production and charging heavy taxes on it, making it unaffordable for the poor. 

Gandhi's Motivation:

Mahatma Gandhi launched the Dandi March as a nonviolent civil disobedience campaign against the unjust salt tax, which was a basic necessity for everyone. 

The March:

Gandhi led a group of 78 followers on a 240-mile march to the coastal town of Dandi. 

Breaking the Law:

On reaching Dandi, Gandhi and his followers made salt from sea water, thus breaking the British salt law and sparking mass civil disobedience. 

Impact:

The Dandi March became a symbol of nonviolent resistance against colonial rule and played a crucial role in igniting the Civil Disobedience Movement, inspiring millions to participate in defying British laws. 

Timeline:

March 12, 1930: Start of the Dandi March from Sabarmati Ashram. 

April 5, 1930: Gandhi and his followers reached Dandi. 

April 6, 1930: Breaking the salt law at Dandi.