Sepoy, 1st Sikh Infantry (Punjab Frontier Force) - This regiment, raised in 1846, was senior among the infantry regiments of the Punjab Frontier Force, that part of the Indian Army which had a special responsibility for keeping the peace on the North-West Frontier. It was one of the first Indian regiments to leave for China in 1900 and, with the 7th Rajputs, was the first of the British contingent to enter the besieged Legations at Peking.
Officer 2nd Battalion Royal Welch Fusiliers Pekin, China 1900. Seen with USMC Officer. RWF had been posted to Hong kong in 1899 and formed part of the second(and successful)force to sent to relief the Foreign Legations at Peking which were under seige by Boxer and Imperial forces.
The Boxer Rebellion, Boxer Uprising or Yihetuan Movement was a violent anti-foreign and anti-Christian movement which took place in China towards the end of the Qing dynasty between 1898 and 1900. Description from imgarcade.com. I searched for this on bing.com/images