There were three notable times when the chain across the Horn was either broken or circumvented.
A famine has been declared in parts of Somalia, and across the Horn of Africa.
Centuries ago, Aksum was the center of an ancient Ethiopian empire that extended across the Horn of Africa and beyond.
Ethiopia and Eritrea, bitter enemies, are suspected of arming the two opposing sides, threatening to ignite ethnic and religious tensions across the Horn of Africa.
More than 10 million people have been affected across the Horn of Africa.
Across the Horn 11 million people require humanitarian assistance.
Britain is playing its part, with help for more than 2 million people across the Horn of Africa.
There are already critical and life-threatening food shortages in Ethiopia and across the Horn of Africa region.
East of the Galata Bridge, another marine unit held the Upper Bridge across the Horn.