On May 10 the sepoys revolted at Meerut; they captured Delhi and proclaimed Bahadur Shah II the emperor of all India. The mutiny spread rapidly through N central India, and, by the end of June, Cawnpore (Kanpur) had fallen to the sepoys of Nana Sahib, and Lucknow was besieged. In repressing the rebellion the British were aided by the loyalty of the Punjab (the Sikhs did not wish to see the restoration of Mughal rule) and the passivity of the south. Troops (largely British) under generals Colin Campbell and Henry Havelock accomplished the reconquest. Delhi was recaptured in Sept., 1857, and Lucknow (which had been abandoned in Nov., 1857) was retaken in Mar., 1858. The rebellion was marked by atrocities on both sides, the British taking savage reprisals for the massacres perpetrated by the rebels.