The Khyber is protected by its own hill tribes. We have enlisted them on the side of law and order by enrolling them into military forces, just as the Scottish Highlanders were enrolled in the British army in the 18th century. Then leaving Peshawar we will visit Quetta, some five hundred miles southwestward, and see there the second great centre of British force on the Frontier. It has been established to command the Bolan route to Kandahar and Herat. The whole army in India is organised with reference to these two points, Peshawar and Quetta, or in other words, the Khyber and the Bolan. There are many other passes in the frontier mountains, but they offer merely loopways from the two main routes. [Sidenote: 4. 12th Bengal Infantry.] [Sidenote: 5. Bombay Mountain Battery.] [Sidenote: 6. Heavy Battery in Elephant Draught.] The Indian forces are now grouped into a Northern and a Southern army. The Northern army is distributed southeastward from Peshawar past Delhi and Allahabad to Calcutta, so that all the forces along that long line may be regarded as supporting the brigades on the Khyber front. The Southern army is similarly posted for the reinforcement of Quetta. It is distributed in the Bombay Presidency and immediately around. The conditions of the defence of India have of course been vitally changed by the construction of the Northwestern Railway from the port of Karachi through the Indus basin, with its two branches towards the Bolan and the Khyber. To-day that defence could be conducted over the seas directly from Britain through Karachi, so that the desert of Rajputana would lie between the defending forces and the main community of India within. [Sidenote: 7. 18th P. W. Tiwana Horse.] [Sidenote: 8. Gurkha Rifles: Physical Drill.] [Sidenote: 9. The Same—Bayonet Practice.] [Sidenote: 10. 32nd Mountain Battery, Advancing Down Hill.] [Sidenote: 11. The Same—Retiring Up Hill.] [Sidenote: 12. Battery in Action.] As we start for Dehra Dun let us stop for a moment on the ridge at Delhi to see a squadron of the 18th Prince of Wales’s Tiwana Horse, recruited partly from among the Sikhs and partly from the Musulmans. Then at Dehra Dun we have the Gurkha Rifles. We see them at physical drill and then at bayonet practice. At the same place we visit a battery of Mountain Artillery, for Dehra Dun is in the Terai, at the foot of the Himalayas. Mountain batteries are much utilised in operations over the broken and hilly country towards the Northwest Frontier. The men are Punjabis; and it will be noticed that the guns are carried by mules. Here we see the battery advancing down hill, and here we see it retiring up hill. Then we have a mountain gun in action.