A very able Hindu gentleman, very loyal to the British, traced the mutiny of 1857 in a great measure to the Afghan campaign of 1842. He said: "It was a direct breach of faith to take the Sepoys out of India. Practically they were compelled to go for fear of being treated as mutineers, but the double pay they received by no means compensated them for losing caste. The Sepoys mistrusted the Government from that time forward, and were always fearing that their caste would be destroyed; besides, the Kabul disaster taught them that Europeans were not invincible." The departure of the English forces was followed by the reestablishment of Dost Mohammed's authority in Afghanistan. Once, at the time of the Sikh insurrection, the Dost crossed the Indian border with two thousand horsemen, and narrowly escaped falling into the hands of the British in the affair of Gujrat, February 21, 1849, where the speed of his horse alone saved him from capture. In 1855 a better understanding was effected between the son of Dost Mohammed and his powerful European neighbor. He reconquered Balkh in 1850, and gained Kandahar by inheritance in 1855, while he lost Herat to the Persians in 1856. With the aid of Great Britain, in 1857, Persia relinquished all claims to Herat, but the Dost had eventually to besiege that city, occupied by a rebellious faction, in 1863, and after a siege of ten months reduced the place, only to find a tomb within its walls. After the usual struggle for the throne, peculiar to a change of dynasty in Afghanistan, Shere Ali, one of the Dost's sons, prevailed, and was recognized in 1868. The next decade was notable for a series of diplomatic manoeuvres between England and Russia for Afghan friendship. Shere Ali now leaned toward the Lion, now in the direction of the Bear, with the regularity of a pendulum. The advances were received with presents and promises on the one hand, and promises, powerful embassies, and imposing military expeditions on the other. On September 21, 1878, a British ambassador was turned back by the Afghan commandant of the frontier fort of Ali Musjid, and on the 20th of November, of the same year, war was declared against Shere Ali by the Anglo-Indian Government. At that time the Russian General Kaufmann was operating on the northern border of Afghanistan with a force of fifteen thousand men and sixty guns, and the Ameer had reason to think that he could rely on Russian cooperation against the English, who, with a force of forty thousand men, promptly invaded his dominion. This force moved into Afghanistan in four columns, under the command, respectively, of Generals Browne, Roberts, Biddulph, and Stewart, with reserves under Generals Maude and Primrose.