He Fought side with the British against the Marathas and the Sikh Jats, winning a famous victory at Laswari in 1803 and second Anglo Maratha wars 1803-1806. After that Mirza Alam Jan Beg continued in British Army and promoted to the position of the commander of Indian contingent in British Army and took part in Anglo Nepalese wars (1814-1816) also known as Gurkha wars under British General Sir David Ochterlony.After his restoration on Gaddi of Nalagarh he invited Mirza Alam Jan to visit Nalagarh; with his family, Mirza Alam Jan was overwhelmed by the warmth of the people of Nalagarh and conveyed his wish to Raja Ram Saran Singh for his permanent stay in Nalagarh. Raja Ram Saran Singh felt honored upon Mirza Alam Jan request and offered him property in Nalagarh in the shape of Fruit Gardens, Fertile lands of cultivation, a Haveli and ask him to live with him as an advisor and a friend of the state. Mirza Alam Jan Beg liked the area and admiration given to him by the people of Nalagarh, decided to leave British services and stayed back with his family in Nalagarh, where he settled rest of his life with his two wives till his death in 1849, he had a long life for more than 100 years.During his stay in Nalagarh Once Mirza Alam Jan had to leave Nalagarh to visit Delhi to settle some issues of British employment, he asked Raja Ram Saran Singh to keep Mirza Alam Jan’s personal treasure as a security deposit with him in his palace to be secure and will take back when he will be back from Delhi. In Delhi the matters were not resolved as he though and upon his return he saw Raja is lying unconscious on his death bed. Shocked and disheartened Mirza Alam Jan came back to his Heveli as soon he reached to his home the death news of Raja Ram Saran Singh came along Mirza Alam Jan Beg could not tolerate this news and died at the spot in the 1849 and buried at Nalagarh. Mirza Khawaja Jan Beg son of Mirza Alam Jan Beg thought how he can claim the family treasure lying in the royal palace and it should be returned to the rightful owner. At the stage of Gaddar (independence movement) of 1857 and other difficulties fallen onto Moghuls are very well known. Now Mirza Khawaja Jan Beg was helpless who lost his family wealth and treasure. The treasure Mirza Khawaja Jan’s father was lying in Royal palace and he could not claim both Mirza Alam Jan Beg and Raja Ram Saran Singh were dead and Mirza Alam Jan’s family did not even know the details of the treasure and the request would have useless, so they kept silence and started waiting for some good comes out from the future for them.