The British sent a mission under an Assyrian-born British subject, Hormuzd Rassam, who bore a letter from the Queen (in response to Tewodros' now three-year-old letter requesting aid). He did not bring the skilled workers as Tewodros had requested. Deeply insulted by the British failure to do exactly as they were told, Tewodros had the members of the Rassam mission added to his other European prisoners. This last breach of diplomatic immunity was the catalyst to Britain launching the 1868 Expedition to Abyssinia under Robert Napier. He traveled from India, then a British colony, with more than 30,000 personnel (a force of 13,000 troops and 26,000 camp followers), which consisted of not only soldiers but also specialists such as engineers. Tewodros had become increasingly unpopular over the years due to his harsh methods, and many regional figures had rebelled against him. Several readily assisted the British by providing guides and food as the expeditionary force marched towards Magdala, where the Emperor had fortified the mountaintop.