Łódź insurrection
The Łódź insurrection, also known as the June Days, was an uprising by Polish workers in Łódź against the Russian Empire between 21 and 25 June 1905. This event was one of the largest disturbances in the Russian-controlled Congress Poland during the Russian Revolution of 1905. Poland was a major center of revolutionary fighting in the Russian Empire in 1905–1907, and the Łódź insurrection was a key incident in those events. For months, workers in Łódź had been in a state of unrest, with several major strikes having taken place, which were forcibly suppressed by the Russian police and military. The insurrection began spontaneously, without backing from any organized group. Polish revolutionary groups were taken by surprise and did not play a major role in the subsequent events. Around 21–22 June, following clashes with the authorities in the previous days, angry workers began building barricades and assaulting police and military patrols. Additional troops were called by the authorities, who also declared martial law. On 23 June, no businesses operated in the city, as the police and military stormed dozens of workers' barricades. Eventually, by 25 June, the uprising was crushed, with estimates of several hundred dead and wounded. The uprising