An avenging army was soon on its way from Calcutta. Murshedabad was captured, but not without a stout resistance, for the drilled troops of the Nawab were vastly superior to the rabble hosts that had fought at Calcutta and Plassy. The British force, however, overcame every obstacle, and pushed on to Monghyr, whilst the Nawab fled to Patna, carrying his prisoners with him to the number of a hundred and fifty souls. At Patna the Nawab heard that Monghyr was taken by the British, and resolved on exacting a terrible revenge. His prisoners were shut up in a large square building with a courtyard in the centre. He ordered Sombre to slaughter the whole, and the miscreant environed the building with sepoys. The British assembled in the courtyard, bent on fighting for their lives. The sepoys climbed to the roof, but were assailed with a storm of brickbats and bottles from the courtyard. Sombre ordered them to fire on the prisoners, but they hung back, declaring that they were sepoys and not executioners, and would not fire on men without arms in their hands. Then Sombre grew furious and violent; struck down the nearest sepoys with his own hands, and threatened and bullied the rest into obedience. The sepoys yielded to their European master. Successive volleys were fired into the courtyard, until it was strewed with dead bodies. Not a single prisoner escaped that horrible slaughter. [Sidenote: Mir Kasim and the Nawab Vizier.] The massacre at Patna sealed the doom of the Nawab. He fled away into Oudh with his family and treasures, but the avenging Furies were at his heels. The Nawab Vizier received him with ostentatious hospitality, but only that he might strip him of his treasures. The Nawab Vizier declared war against the British for the restoration of Mir Kasim, but it was only that he might eventually get the Bengal provinces into his own hands. [Sidenote: Battle of Buxar, 1764.] The war lasted many months, but was brought to a close in 1764 by the battle of Buxar. The victory gained by Sir Hector Monro at Buxar on the Behar frontier was as decisive as that of Plassy. The Nawab Vizier fled away in terror to the Rohilla Afghans beyond his north-west frontier, leaving his dominions at the absolute disposal of the British; and Sir Hector Monro marched on to the capital at Lucknow and took possession of the whole of Oudh. [Sidenote: British triumph.]