The statement "The battle of Champaran is owned" was exclaimed by Mahatma Gandhi in the context of his involvement in the Champaran Satyagraha, a significant event in India's freedom struggle. This incident is discussed in Chapter 5 - Indigo - Explanation and Summary of the CBSE Class 12 Flamingo textbook.

Context of the Champaran Satyagraha:
1. Indigo cultivation: During British colonial rule, indigo cultivation was prevalent in Champaran, a district in Bihar, India. The British planters forced local farmers to cultivate indigo on a large scale, leaving them impoverished and exploited.
2. Oppression and exploitation: The farmers were bound by oppressive agreements and were forced to grow indigo on a portion of their land, known as the Tinkathia system. This system resulted in the farmers being unable to grow food crops for their sustenance.
3. Mahatma Gandhi's arrival: In 1917, Mahatma Gandhi arrived in Champaran after being invited by Rajkumar Shukla, a local farmer. Gandhi saw the plight of the indigo farmers and decided to support their cause.

Gandhi's involvement in the Champaran Satyagraha:
1. Investigative work: Gandhi conducted extensive research and inquiry into the issues faced by the farmers. He met with the local people, collected information, and visited indigo plantations.
2. Mobilizing the farmers: Gandhi organized meetings and gatherings to raise awareness among the farmers about their rights and the unjust practices of the British planters. He encouraged them to resist the exploitative system.
3. Nonviolent resistance: Gandhi advocated for nonviolent resistance and urged the farmers to refuse to comply with the indigo cultivation contracts. He emphasized the power of truth and nonviolence to bring about change.
4. Negotiations with British officials: Gandhi and a team of lawyers represented the farmers' grievances in front of the British officials. They demanded a repeal of the unjust tinkathia system and proper compensation for the farmers.
5. Success and impact: The Champaran Satyagraha was a significant success, with the British authorities eventually giving in to the demands of the farmers. This marked an important milestone in Gandhi's journey as a leader of nonviolent resistance.

In conclusion, the statement "The battle of Champaran is owned" refers to Mahatma Gandhi's claim of victory in the Champaran Satyagraha. It signifies the successful resistance against the oppressive indigo cultivation system and the recognition of the rights of the farmers. This event played a crucial role in shaping Gandhi's ideology of nonviolent resistance and marked his emergence as a prominent leader in India's freedom struggle.