sentences:  When the Egyptian garrison in Harar was eventually evacuated in 1885, Zeila became caught up in the competition between the Tadjoura-based French and the British for control of the strategic Gulf of Aden littoral.By the end of 1885, the two powers were on the brink of armed confrontation, but opted instead to negotiate.On 1 February 1888 they signed a convention defining the border between French Somaliland and British Somaliland.