On the 14th December Gordon wrote, "In ten days the town may fall." There were then in store 83,525 okes (or 227,000 lbs.) of biscuit, and 546 ardebs (or 2,700 bushels) of dhoora (Indian corn), representing approximately eighteen days' rations for the troops alone. But Gordon had already, on the 22nd November, found it necessary to issue 9,600 lbs. of biscuit to the poor in the town, so great was the destitution which prevailed. As the siege progressed this state of things became more and more aggravated, and the Government supplies had to be further drawn on for the benefit of the civil population.

Ever since the 3rd of November the Fort of Omdurman had been cut off from communication with Khartoum. It was then provisioned only for a month and a half, and at the end of the year the garrison was in great straits from want of food. Gordon made one or two efforts to relieve the garrison, but, having no longer his steamers, four of which had gone to meet the British expedition, and the fifth having been lost with Colonel Stewart, he was unable to open communication.

On the 5th January, 1885, Faragallah signalled that his provisions and ammunition were alike exhausted, and Gordon was compelled to reply that there was nothing for it but to surrender. Faragallah and the whole of the force at Fort Omdurman then capitulated, and were transferred to the Mahdi's camp, where they were well treated, as an encouragement to others to join the Dervish ranks.

On the 6th January, seeing that the garrison of Khartoum was becoming daily more and more reduced by want of food, and that existence for many of the inhabitants was almost impossible, Gordon issued a Proclamation authorizing as many of the civil population as liked to leave the town and go over to the Mahdi. Some thousands of natives took advantage of the offer, and Gordon sent with them a letter to the Mahdi, asking him "to feed and protect these poor Moslem people as he (Gordon) had done for the last nine months." After the fugitives had left, it was estimated that only about 14,000 remained in the town, out of a population shown by the census taken in the September previous as 34,000.

The fall of Omdurman was a great blow to the garrison of Khartoum, who thus lost the only position they had on the west bank of the White Nile. The Dervishes were thenceforth able to close the river to Gordon's two remaining steamers, and to establish ferries south of Khartoum, giving easy communication between the camps at Omdurman and those of Wad en Nejumi and Abu Girgeh. Khartoum was practically hemmed in on three sides.

The food difficulty became daily more serious. To make matters worse, those in charge of the biscuit and dhoora stole quantities of both, as occasion offered. The officer in charge of the stores was arrested and brought before a court of inquiry, but Gordon, realizing the emergency of the situation, had to point out to those conducting the investigation the necessity of not inquiring too critically into the matter.

The Island of Tuti was still held by Gordon's forces, and the crops there were reaped under the fire of the forts, and stored in the Commissariat. This produced about 1,600 bushels of corn altogether, which, with the remaining biscuits, were served out to the soldiers. When this was finished, Gordon ordered a search to be made in the town, with the result that further quantities (32 bushels only) were discovered in some of the houses, and also buried in the ground. These also were taken to the Government store, the owners being given, in every case, receipts for the quantities carried off. The search was conducted daily until there was nothing left in possession of the inhabitants.

Soon all that had been collected in the Commissariat was finished, and then the soldiers and inhabitants were reduced to eating dogs, donkeys, skins of animals, gum, and palm-fibre. Then an actual famine prevailed. The gum produced diarrhœa, and the soldiers became so weak that they could scarcely man the fortifications.[119] The situation of the civil inhabitants was even worse. Many died of actual starvation, and corpses lay about the streets, no one having sufficient strength or energy to bury them.

All this time the enemy kept up a fusillade on the garrison, occasionally killing a few of their number. The soldiers were also harassed by repeated night attacks.[120]

Although it must have been evident to Gordon that the end could not be far off, he continued to encourage the people by Proclamations announcing the near approach of the British Relief Expedition, and even went so far as to hire some of the principal houses on the river for the reception of the men belonging to it. Day by day he watched from the roof of his Palace, in the hope of seeing them arrive. After awhile many of the inhabitants began to lose faith in him, and commenced opening communications with the Mahdi.