As long as the telegraph line was still available to Cairo, Gordon kept the authorities informed of the state of affairs and pointed out what should be done to ensure success. He asked especially that the road from Berber to Suakin should be held, for from this line also the Sudan could be controlled, but his advice was not attended to and Berber was eventually surrounded by the Mahdi's troops and captured. Several chiefs north and north-east of Khartum, who had previously been friendly disposed, now joined the Mahdi. News of fresh desertions came constantly to Khartum, and even in the town itself Gordon was surrounded by traitors. On March 10 the telegraph line was cut and then followed six months of silence, during which the world learned little or nothing of the brave soldier in the heart of Africa. On March 11 Arab war parties appeared on the bank of the Blue Nile, for the Mahdi was drawing his net ever closer round the unfortunate town.
During the preceding years the Egyptian Government had caused Khartum to be fortified after a fashion, and during the earlier months of the siege Gordon worked day and night to strengthen the defences. His soldiers threw up earthern ramparts round the town, a network of wire entanglements was set up, and mines were laid at places where an assault might be expected. At the end of April the town was entirely blockaded, and only the river route to the north was still open. At the beginning of May the Arabs crossed the Blue Nile, suffering great losses from exploding mines and the guns of the town. In the early part of September there were still provisions for three months, and the Arabs, perceiving that they could not take the town by storm from the White Pasha, resolved to starve it out.
The Nile was now at its highest, and huge grey turbid volumes of water hurried northwards. Now was the only chance for a small steamer to try to get to Dongola, where it would be in safety. On the night of September 9 a small steamer was made ready for starting, and Gordon's only English comrades, Colonel Stewart and Mr. Power, went on board, together with the French Consul, a number of Greeks, and fifty soldiers. They took with them accounts of the siege, correspondence, lists and details about provisions, ammunition, arms, men, and plans of defence, and everything else of particular value. Silently the steamer moved off from the bank, and when day dawned Gordon was alone. Alas, the little steamer never reached Dongola, for it was wrecked immediately below Abu Hamed. Every soul on board was murdered, and all papers of value fell into the hands of the Mahdi. On the other hand, Gordon's diary from September 10 to December 14, 1884, is still extant, and is wonderful reading.
By this time the British Government had at last decided to send an expedition to relieve Khartum. River boats were built in great numbers, troops were equipped for the field, the famous general, Lord Wolseley, was in command, and by the middle of September the first infantry battalion was up at Dongola on the northern half of the great S of the Nile. But then the steamers had only just arrived at Alexandria, and had to be taken up the Nile and tediously dragged through the cataracts, while the desert column which was to make the final advance on Khartum had not yet left England. A long time would be required to get everything ready.
In Khartum comparative quiet as yet prevailed. The dervishes bided their time patiently, encamping barely six miles from the outworks. Shots were exchanged only at a distance. On September 21 Gordon learned by a messenger that the relief expedition was on the way, and ten days later he sent his steamboats northwards to meet it and to hasten the forwarding of troops. But thereby he lost half of his own power of resistance.
On October 21 the Mahdi himself arrived in the camp outside Khartum, and on the following day sent Gordon convincing proofs that Stewart's steamboat had sunk and that all on board had been slain. He added a list of all the journals and documents found on board. From these the Mahdi had learned almost to a day how long Khartum could hold out, the strength of the garrison, the scheme of defence, where the batteries stood and how long the ammunition would last. This was a terrible blow to the lonely soldier, but it did not break down his courage. The death of Stewart and his companions grieved him inexpressibly, but he sent an answer to the Mahdi that if 20,000 boats had been taken it would be all the same to him—"I am here like iron."
In the relief expedition was a major named Kitchener, who was afterwards to become very famous. He tried to get into Khartum in disguise to carry information to Gordon, and he did succeed in sending him a letter with the news that the relieving force would set out from Dongola on November 1. When the letter reached Gordon the corps had been two days on the march, but the distance from Dongola to Khartum is 280 miles in a straight line.
By November 22 Gordon had lost nearly 1900 of his fighting men, but his diary shows that he was still hopeful. On December 10 there were still provisions for fifteen days. The entries in the diary now become shorter, and repeatedly speak of fugitives and deserters, and of the diminishing store of provisions. On December 14 Gordon had a last opportunity of sending news from Khartum, and the diary which the messenger took with him closes with these words: "I have done the best for the honour of our country. Good-bye."
After the sending-off of the diary impenetrable darkness hides the occurrences of the last weeks in Khartum. One or two circumstances, however, were made known by deserters. During the forty days during which the town held out after December 14, 15,000 townspeople were sent over to the Mahdi's camp, and only 14,000 civilians and soldiers were left in the doomed city. Omdurman fell, and the Mahdi's troops pressed every day more closely on all sides. Actual starvation began, and rats and mice, hides and leather were eaten, and palms stripped to obtain the soft fibres inside. But the White Pasha rejected all proposals to surrender.
Meanwhile the relief columns struggled southwards and on January 20, 1885, reached Metemma, only a hundred miles from Khartum. There they fell in with Gordon's boats, which had lain waiting in vain for four months, and four days later two of the boats started for Khartum.