Neil MacGregor's history of the world as told through things. Throughout this week he is examining the great shifts in the global economy and in imperial power in the 19th century. Today he is with a large wooden drum that the legendary Kitchener of Khartoum brought from Sudan for Queen Victoria, just after his army had killed 11000 Sudanese soldiers in battle. The drum takes Neil back to the extraordinary history that has played out along the Nile and to the great internal power struggles of the period. The writer Dominic Green and the broadcaster Zeinab Badawi reflect on the meaning of the drum and its place in Sudanese history. Producer: Anthony Denselow