The story is set against the backdrop of a little-known saga in 1930s British colonial India's East Bengal (now Bangladesh), where a group of schoolboys and young women, led by a schoolteacher, Masterda Surya Sen, dared to take on the Empire. Chittagong is the story of a diffident 14-year-old boy, Jhunku. Swept up into this seemingly impossible mission, the reluctant teenager battles with self-doubts to achieve an improbable triumph.
Jhunku, now a 23-year-old youth, is being chased by the Bengal police. He hides himself in a bunker with his childhood friend Aparna. While hiding, he begins to reflect on his past hopes and dreams. The story goes to a flashback to narrate the events that happened 10 years ago.
In 1930, Surya Sen and his followers are protesting the death of the revolutionary Jatin Das. Jhunku is not allowed to join them by his lawyer father, who wants him to study in England. Apart from fearing his father, Jhunku is also torn between his admiration and respect for the magistrate, Wilkinson, and his wife, who show great likings for him, and his fascination for the charismatic figure of Masterda, who is followed and revered by most of his friends. Jhunku, due to his faith in Wilkinson, who is personally against torturing revolutionaries, has great belief in British justice and believes that by getting an English education he might better equip himself to free his country. This causes arguments between him and his friends, especially Aparna. Wilkinson is opposed by the police inspector Major Johnson, who defies his orders and arrests the protesters and badly tortures Masterda.
In protest, some students hit the strict police officer Maj. Johnson (Alexx O'Nell) by spilling oil under his motorcycle, making him fall. Enraged, Johnson makes random enquiries about the culprits but is unsuccessful. However, Wilkinson manages to confirm the truth out of Jhunku, and an enraged Johnson then shoots Sukhen, one of the boys involved. This incident makes Jhunku an outcast amongst his friends, and he becomes determined to avenge the death of Sukhen. Soon afterwards, Johnson is made the DIG of police, although Wilkinson had requested his transfer. This incident further shocks Jhunku. All his faith in his tutor, Sir Wilkinson, is lost, and he joins Masterda's army. Meanwhile, Pritilata Waddedar, a school teacher by profession, is fascinated by the ideologies of Masterda and has great admiration for him. She wishes to join him in his future plans against British rule. She also appears to be in love with Nirmal Sen, but he is reluctant to express his feelings.
Masterda and his comrades Nirmal Sen, Loknath Bal, Ambika Chakraborthy, and Ananta Singh train the 50-odd students and plan to capture the city of Chittagong on 18 April 1930 by disconnecting all modes of communication. As per plan, the armoury of the police is captured by a group of revolutionaries led by Ganesh Ghosh, and revolutionaries led by Lokenath Baul take over the Auxiliary Force armoury. Unfortunately, the machine guns are not located. The revolutionaries also dislocated telephone and telegraph communications and disrupted the movement of the trains. After the successful raids, all the revolutionary groups gathered outside the police armoury where Surya Sen takes a military salute, hoisting the national flag, and proclaims a provisional revolutionary government. The whole town is overjoyed at the success of the Indian Republican Army, and Chittagong is officially conquered by Surya Sen and his boys for one day. However, reinforcements from Calcutta soon set out to capture the rebels. Knowing of the army attack, the revolutionaries leave town before dawn and march towards the Jalalabad hill ranges, looking for a safe place. A confrontation ensues between British-led forces and the revolutionaries, the latter of whom emerge triumphant. In response, the colonial authorities call for reinforcements in the form of machine gunners, who inflict heavy casualties on the revolutionaries. Harish, also known as Tegra, the younger brother of Lokenath and friend of Jhunku, dies.
Soon after, revolutionaries disperse in smaller groups to nearby villages. Ahsanullah Khan (Anurag Arora) from CID comes to Chittagong and cracks down on the revolutionaries. Jhunku is arrested and is severely beaten by Johnson and Ahsanullah during interrogation; he refuses to betray his leaders and comrades. He is sentenced to Kaala-Paani for life imprisonment. In due course, many revolutionaries and police officials are killed in the gunfights, including noted revolutionary Nirmal Sen and police CID chief Ahsanullah. However, Pritilata Waddedar successfully attacks the Pahartali European Club and assassinates DIG Johnson; being gravely wounded, she commits suicide by swallowing cyanide.
After a prolonged search, the police arrest Master Da Surya Sen and sentence him to death by hanging. Thus Jhunku ends narrating the part and says that he was released in 1939 and again participated in the uprisings with Aparna. In one such incident, there is a plan to attack the granaries where the colonial authorities and Indian landlords keep the grain they tax from the peasantry. The British block all the roads to godowns, leading Jhunku to an idea to create underground dungeons till the granaries. Twenty villages join hands and operate. The last scene shows Jhunku being stopped by Maj. Wilkinson, who says he is still sympathetic to Jhunku and wants him to go away; otherwise, he will be bound to arrest him once again. Jhunku signals to Wilkinson that everyone is awake and shows him the mass crowd arising from the dungeons and heading towards the government granaries that forces Wilkinson to retreat. This is named the Tebhaga movement of 1945, which marked the end of British Raj in India. The film ends with the memorable song "Ishaan."
The album was met with critical acclaim. Kartik of Milliblog praised the album, calling it a "classy opening to Shankar Ehsaan Loy’s 2012 account".[23]Music Aloud remarked that the soundtrack was the 'best of SEL in a long time'.[24]DunkDaft quoted about the music as 'A sheer delightful soundtrack for the period film'.[25]
Khalid Mohamed praised the score as "evocative",[26] while Shabna Ansari of NDTV deemed it "soulful".[27]
The film was released worldwide on 12 October 2012. It garnered mostly positive reviews from critics.
Srijna Mitra Das of Times of India gave it 3.5 stars. "Like a Chittagong orchid, the movie takes time to blossom – but when it does, it's beautiful. And pleases a certain master" said ToI.[29] Rediff Movies called Chittagong honest and gave it 3 stars: "Chittagong is an important film despite its shortcomings," writes Raja Sen of Rediff.[30]Taran Adarsh of Bollywood Hungama gave 3.5 stars.[31] Aniruddha Guha of DNA gave it 3.5 stars. "Chittagong is the kind of film that will leave you with a heavy heart, and moved. Give it a shot." said DNA.[32] MOZVO, social movie rating site, gave Chittagong 3.5 out of 5 making it a 'Recommended' movie.[33] Shubra Gupta of the Indian Express gave 3.5 stars.[34] Jim Luce of Huffington Post wrote "The film Chittagong is a brilliant, poignant action-drama, made more so by the fact that it is true."[35]
^Ansari, Shabana, ed. (21 November 2013). "The After Hrs review: Chittagong is compelling". Retrieved 13 October 2012. The film is seen through the eyes of the youngest soldier in the Indian freedom struggle – Subodh Roy aka Jhunku (Delzad Hiwale).