Dhaka Anushilan Samiti
Dhaka Anushilan Samiti was a branch of the Anushilan Samiti founded in the city of Dhaka in November 1905. Initially a group of eighty under the leadership of Pulin Behari Das, it "spread like wildfire" throughout the province of East Bengal. More than 500 branches were opened, linked by a "close and detailed organization" to Pulin’s headquarters at Dhaka. It absorbed smaller groups in the province and soon overshadowed its parent organisation in Calcutta. Branches of Dhaka Anushilan emerged in the towns of Jessore, Khulna, Faridpur, Rajnagar, Rajendrapur, Mohanpur, Barvali, Bakarganj and other places. Estimates of Dhaka Anushilan Samiti's reach show a membership of between 15,000 and 20,000 members. Within another two years, Dhaka Anushilan would devolve its aims from the Swadeshi to the dedicated aim of political terrorism. The "Dhaka Anushilan Samiti" embarked on a radical program of political terrorism. It broke with the "Jugantar group" due to differences with Aurobindo's approach of slowly building a base for a revolution with a mass base. The Dhaka group saw this as slow and insufficient, and sought immediate action and result. It was responsible for a number of political assassinations, most notably the murder of D.C. Allen. However, it reached a temporary halt after the arrest and deportation of Pulin Das and the Barisal Conspiracy Case in 1913. Dhaka Anushilan decided not to participate in the German plot of World War I. After the war, it continued in its violent movement, and some of its members went on to form the Neo-violence group.
Nankana massacre
The combined Jatha took a Hukamnama and started for the Gurdwara at about 10 PM on that night so as to reach there by early morning at "Amrit vela" (nectral hours). On the way 50 more Sikhs joined the "Shaheedi Jatha" and total number swelled to about 200.
At Chanderkot Jhal, Jathedar Lachhman Singh decided to wait for Kartar Singh Jhabber and his Jatha. They waited for a while in vain and finally Jathedar Dharowali decided to cancel the plan for further march to Nankana Sahib. But at this very moment, Jathedar Tehal Singh came forward and addressed the Shaheedi Jatha not to vacillate even for a moment from forward march since ""the prayers having already been said and the action plan having already been decided with Guru's word, it is now imperative for now to move forward"". Advising further that ""all the members shall keep cool even under extreme provocations"". From here-onwards, Jathedar Tehal Singh took over the supreme command of the Shaheedi Jatha and resumed the march to Nankana. By almost at "Amritvela", the Shaheedi Jatha reached the Railway-crossing near Nankana Sahib. Some of the Jatha members raced towards Darshani Deori to take possession of the Gurdawara, but at this very moment, Chaudhury Paul Singh Lyallpuri showed up "with the latest decision of Shiromani Committee advising to postpone the action for taking possession of the Gurdwara". Having conveyed the information, Bhai Paul Singh grabbed Jathedar Lachhman Singh from his waist behind and persuaded him not to proceed further. Once again, Jathedar Tehal Singh took the initiative and shaking Chaudhury Paul Singh forcefully off from the person of Jathedar Lachhman Singh, he once more challenged the Shaheedi Jatha to get ready for the sublime action. He once again spoke: "" Khalsa ji, the time is not to stop now, but to act. We have come here to achieve martyrdom under Guru's word. This is very un-Sikh-like to backout from one's commitment at the last moment" " Saying this, Tehal Singh walked with the Jatha towards the Gurdwara. Lachhman Singh and others repeatedly requested him to relent, but Tehal Singh stuck to his Ardās.