Since then December 4 has been observed as Kamalpur Free Day in a befitting manner every year.
Kamalpur was under sector 11. Major (later Colonel) Abu Taher was the commander of the sector. Headquarter of sector 11 was situated Mohendraganj under the Meghalaya state of India only two kilometers away from Kamalpur camp.
The sector was divided into eight sub-sectors as Mohendraganj, Mankarchar, Purakasia, Dhalu, Bagmara, Shibbari, Rangra and Moheshkhali. Under the sector 22,000 freedom fighters including 3,000 regular disciplined forces were fighting during the liberation war.
Freedom fighters and Pakistan Army confronted 18 bloody battles from June 12 to November 28 in 1971 war at Kamalpur. In the battles, 194 freedom fighters embraced martyrdom including Captain Salah Uddin Momtaj. During the battles, 497 Pakistani troops were also killed. Besides, sector commander Major Abu Taher had lost his one leg in a battle on November 14 in 1971 at Dhanua Kamalpur.
Being strategically important the Pakistani army fortified the camp with heavy weapons and troops as the camp situated near Mohendraganj in India.
Before capturing the camp, the allied force made an attack on November 23. After a 10 days war the allied force overpowered Pakistani army on the day in 1971 and captured Dhanua Kamalpur, the important camp of Pakistani occupation.
On that day Ahasan Malik Khan, Garrison Commander, 31 Beluch Regiment along with 162 soldiers and huge ammunition surrendered to the Hardeb Shingh Clayer, Brigade Commander of the allied force.
Company Commander, freedom fighter Syed Sadruzzaman Helal who led battle 14 times against Pakistani Army at Kamalpur camp said before surrender Bashir Ahmed carried surrender letter to the Army camp at 9:00 am. When he did not come back another freedom fighter Anisul Haque Akanda took surrender letter to the Army camp, he added. At last, the Pakistani Army surrendered at afternoon.