 Complete the following phrase:  In 1898, after time spent serving in Gibraltar, St. John was posted on a Nile Expedition. This led to him seeing action at the Battle of Omdurman in Sudan. With the outbreak of the Second Boer War, St John was part of the 3rd Grenadier Guards sent to South Africa. On 23 November 1899, the 3rd Grenadier Guards were involved in the 