 Complete the following phrase:  However, in 1882 a nationalist revolt occurred in Egypt, headed by Colonel Urabi. There was a perceived danger to the Suez Canal, and therefore British communications with its to Indian empire, as well as to British holders of Egyptian bonds. At first, Gladstone appealed to the Concert of Europe to take collective action, although this was met by unenthusiastic responses. France initially sent warships to join the Royal Navy at Alexandria, but refused to send military forces in fear of weakening its defences against Germany. On 10 July Gladstone instructed that an ultimatum be given to Urabi to halt military fortifications of Alexandria within twelve hours. Urabi did not answer and so on 11 July the Royal Navy 