Chapter 6 analyses the connections between trans-imperial labor migration and Ottoman industrial and urban modernization in the nineteenth century. In a context marked by the mechanization of industrial production through technology transfer, the increasing political-economic ties between the Ottoman and British states, and the scarcity of workers with mechanical skills in Istanbul, hundreds of British industrial workers migrated to Istanbul to work mostly in the arsenal, as well as some other state factories. This chapter narrates the history of these workers and the community they established in Hasköy beginning with the mechanization efforts in the 1830s until the economic crisis in the mid-1870s. It analyses the larger context of British workers’ migration from Britain, their relations with the Ottoman state officials and local workers, and their experiences in the workplace and the city. It demonstrates how their contentious relationship and effective struggles pushed the state authorities to deploy skilled military workers, who were the products of the processes described in the previous chapter, to decrease and eliminate its dependence on them.