Succession crises of 1712 When Prince Farrukhsiyar first arrived at Azimabad, Syed Hussain Ali Khan was away on an expedition, apparently the recapture of Rohtas fort of Bihar, which about this time had been seized by Muhammad Raza ''Rayat Khan''. The Sayyids had felt annoyed on hearing that Farrukhsiyar had issued coin and caused the khutba to be read in his father, Prince Azim-ush-shan's, name, without waiting to learn the result of the impending struggle at Lahore. Thus on his return to his headquarters his first impulse was to decline altogether that Prince's overtures. In truth, no attempt could well look more hopeless than that upon which Prince Farrukhsiyar wished to enter. The Prince's mother now hazarded a private visit to the Sayyids mother, taking with her little granddaughter. Her arguments rested on the fact that the Sayyids position was due to the kindness of the Prince's father. That father, two brothers, and two uncles had been killed, and the Prince's own means were insufficient for any enterprise. Let Syed Hussain Ali Khan then choose his own course, either let him aid Prince Farrukhsiyar to recover his rights and revenge his father's death, or else let him place the Prince in chains and send him a prisoner to Emperor Jahandar Shah. Here the Prince's mother and daughter bared their heads and wept aloud. Overcome by their tears, the Sayyida called her son within the harem. The little girl fell bareheaded at his feet and implored his aid. His mother told him that "whatever was the result he would be a gainer: if defeated, his name would stand recorded as a hero till Judgment Day; if successful, the whole of Hindustan would be at their feet and above them none but the Emperor”. Finally she exclaimed, “If you adhere to Emperor Jahandar Shah, you will have to answer before the Great Judge for disavowing your mother's claim upon you.” At these words Syed Hussain Ali Khan took up the women's veils and replaced them on their heads swearing a binding oath that he would espouse the Prince's cause. 

The next night Prince Farrukhsiyar presented himself at the Khan's house, saying that he had come either to be seized and sent to Emperor Jahandar Shah or to enter into an agreement for the recovery of the throne. The Sayyid bound himself finally to fight on Prince Farrukhsiyar's behalf. He wrote at once to his elder brother, Syed Hassan Ali Khan Barha, at Allahabad, inviting him to join the same side, and Prince Farrukhsiyar addressed a farman to him making many promises, and authorising him to expend the Bengal treasure, then at Allahabad, on the enlistment of troops. It is quite clear that at this time, or soon afterwards, the two chief places in the Empire, those of Vizier and of Amir ul Umara were formally promised to the two brothers as their reward in case of success. Syed Hassan Ali Khan Barha, on being superseded at Allahabad, gives in his adhesion to Prince Farrukhsiyar. At first Syed Hassan Ali Khan Barha's intention was to submit to Emperor Jahandar Shah, the de facto Emperor, to whom he sent letters professing his loyalty and offering his services. Three months before the death of Emperor Bahadur Shah, he had gone out towards Jaunpur to restore order. In this he was not successful and the pay of his soldiers fell into arrears. The men raised a disturbance, and Syed Hassan Ali Khan Barha's only anxiety was to escape from them and take shelter within the fort of Allahabad. He promised publicly that as soon as he reached the city, all the collections then in the hands of his agents should be made over to the troops. On the return march, word came of Emperor Bahadur Shah's death. While Syed Hassan Ali Khan Barha was still in expectation of a favourable reply to his letter to Emperor Jahandar Shah, he was surprised to learn that his Government had been taken from him, and that the deputy of the new governor was on his way to take possession. The province had been granted to a Gardezi Sadaat of Manikpur, subah Allahabad, one Raji Muhammad Khan, who had risen to notice in the recent righting at Lahore, and through the reputation thereby acquired, had been appointed Mir Atish or general of artillery. 

The new governor nominated as his deputy his relation, one Syed Abdul Ghafoorr (a descendant of Syed Sadar Jahan, Sadar-us-Sadur, Pihanwi). Syed Abdul Ghafoor obtained contingents from one or two zamindars and collected altogether 6,000 to 7,000 men. When he drew near to Karra Manikpur, Syed Abul Hasan Khan, a Sayyid of Bijapur, who was Syed Hassan Ali Khan Barha's Bakhshi, advanced at the head of 3,000 men to bar his progress. At the Battle of Sarai Alam Chand on 2 August 1712 with Abul Hasan Khan's victory for Syed Hassan Ali Khan Barha it became clear now that the Sayyids were allied against the Emperor for the new contender Prince Farrukhsiyar. Prince Farrukhsiyar, meanwhile, had marched out with an army along with Syed Hussain Ali Khan Barha from Patna to Allahabad to join Syed Hassan Ali Khan Barha as soon as possible. Emperor Jahandar Shah learning of the defeat of his General Syed Abdul Ghafoor sent his own son Prince Azzu-ud-Din along with Generals Lutfullah Khan and Khwaja Hussain Khan Dauran to face this army. The Second Battle of Khajwah was fought in Fatehpur District, Uttar Pradesh on 28 November 1712.Prince Farrukhsiyar decisively defeated Prince Azzu-ud-Din forcing Emperor Jahandar Shah and his Vizier the Great Zulfiqar Khan Nusrat Jung to take the field. At the Battle of Agra fought on 10 January 1713, Prince Farrukhsiyar won decisively and became the Emperor of the Mughal Empire succeeding his uncle Jahandar Shah.