On the 26th of October a defiant reply to the Viceroy’s letter was received from the Ameer, and an ultimatum was in consequence sent to him, to the effect that unless the British demands were complied with, the troops would advance across the frontier. No reply having been received from him up to the night of the 20th November, orders were given to the troops to advance, and upon the following morning Generals Roberts and Browne advanced across the frontier with their respective columns.

The division of General Browne was divided into four brigades. The first, under General Macpherson, consisted of the fourth battalion of the Rifle Brigade, the 20th Bengal Infantry, and the 4th Ghurkas, with a mountain battery. These were to go round by a mountain road, to make a long circuit, and to come down into the pass at a village lying a mile or two beyond Ali-Musjid. The second brigade, under Colonel Tytler, consisting of the first battalion of the 17th Foot, the Infantry of the Guides, the 1st Sikhs, and a mountain battery, were to take a hill opposite to Ali-Musjid, and capture some batteries which the Afghans had erected there; while the third and fourth brigades were to advance direct up the valley. The former of these brigades consisted of the 81st, the 14th Sikhs, and the 24th Native Infantry. The fourth brigade was composed of the 51st Foot, the 6th Native Infantry, and the 45th Sikhs. With them was a mountain battery, and a battery of Horse Artillery.

The fort of Ali-Musjid is situated on a rock standing out in the valley, at a distance of some six miles from the frontier. It is a most commanding position, and, flanked as it was by batteries on the hillsides, was a most formidable place to capture. The advancing column marched forward until from a rise in the valley they could see Ali-Musjid at a distance of a mile and a half. The fort at once opened fire. The gunners there had been practising for some weeks, and had got the range with great accuracy. The column was therefore halted, and the men allowed to eat their dinners, as it was desired that the flanking columns should get into position before the front attack began. The guns of the battery answered those upon the fort, and a battery of 40-pounders coming up and opening fire, their effect upon the fort was at once visible.

The Sikhs were now thrown out upon the hillside, and these began a heavy musketry fire against the Afghans in the batteries there. Presently a general advance was ordered. The 81st and 24th Native Infantry advanced on the right-hand slopes of the valley, while the 51st and 6th Native Infantry and the Sikhs worked along on the left.

The scene is described as one of the most picturesque ever seen in warfare. From the fortress standing on the perpendicular rock in the centre of the valley, the flashes of the great guns came fast and steadily, while the edges of the rocks and forts were fringed with tiny puffs of musketry. On the British side the heavy 40-pounders and the batteries of Horse and Royal Artillery kept up a steady fire, while both sides of the steep hill-slopes were alive with British infantry, the quick flash of the rifles breaking from every rock and bush.

Gradually our skirmishers advanced until they were nearly abreast of the fort; but, so far, there was no sign that Macpherson’s brigade had accomplished its task and carried the hill, or that Tytler had worked round to the village in the rear. Some attacks, however, were made upon the Afghan intrenchments. These, however, were unsuccessful, and some valuable lives were lost. Major Birch and Lieutenant Fitzgerald, both of the 27th Native Infantry, were killed; Captain Maclean, of the 14th Sikhs, was wounded; and between thirty and forty rank and file killed and wounded.

As the fort and its defences could not have been carried without vast loss of life, it was now determined to halt, in order to give the flanking columns time to get in their places. These, who had met with enormous obstacles on their march, arrived in the night at their respective destinations, and the defenders of Ali-Musjid, taken by alarm at the news that forces were advancing which would cut off their retreat, precipitately abandoned their posts and fled. A great number were taken prisoners, and in the morning the troops occupied Ali—Musjid without resistance. So completely taken by surprise were the Afghans at the easy capture of a fort which they believed to be absolutely impregnable, that they fled without further resistance; and the British, moving quietly up the valley, occupied place after place with scarcely a shot fired until they reached Jellalabad.

In the meantime, General Roberts was advancing up the Kuram Valley. The tribes here greeted our advance with pleasure, for they were tributary to Cabul, and viewed the Afghan rule with aversion. It was upon the Peiwar Khotal, a steep and extremely strong position, that the Afghans determined to take their stand.

On the 30th of November the forces approached this position. The Afghans remained silent, and preparations were made for encamping at the commencement of the pass. The enemy, however, were nearer and more active than had been supposed, and scarcely had the troops taken up their position, when a heavy fire was opened upon them from above, and the force had to retire hastily out of range. Some of the infantry were pushed forward, and for a time brisk firing took place. The troops then encamped for the night out of range of shot. The next day was passed in endeavouring to feel the position of the enemy, who occupied the line upon the top of the crest, and it was not until the 2nd that an attack was delivered.

After thoroughly reconnoitring the ground, it was found that the position of the Afghans was too strong to be attacked in front, and it was determined to turn it by a long and very difficult night-march of nine miles, up a path leading to the extreme left of the enemy’s position. The 72nd Highlanders, the 5th Ghurkas, and the 29th Native Infantry were told off for the service, and started after nightfall. At daybreak they came upon the enemy’s pickets, and a fierce fight took place, the Afghans defending themselves desperately. Captain Kelso brought up his battery of mountain guns, and did good service in aiding the infantry, who were all fiercely engaged. He himself, however, was shot dead.