Because Russia coveted India's wealth for a long time, Britain entered India in the17th century. If Russia insists on going south, the two countries with the largest territory on earth at that time will inevitably collide in Asia. But out of the desire for wealth, Russia took action. But for Russians, the only choice to enter the Indian Peninsula is khyber pass and Bolan Pass, and it is less difficult to enter India by land, that is, through Afghanistan.

In order to facilitate the action, Russia fostered an agent Persia in West Asia. Under the command of the Russians, 30,000 Persian troops surrounded Herat in Afghanistan. In the face of the fierce Russian offensive, the British who ruled India could not sit idly by. On the one hand, British military advisers assisted the Afghan army in training and guarding the city. On the other hand, Britain immediately sent the Royal Navy to occupy Kharg Island in Persia. This repelled the Persian attack.

After the plan to open the door to India through the agent Persia failed, the Russians decided to go into battle in person, expanding from the Kazakh prairie to Central and South Asia and approaching India. There are several reasons why Russia chose to March into Central Asia in the mid-Kloc-0/9th century: First, Russia's expansion in other directions has been basically completed, and it is difficult to continue. Second, after years of reconnaissance and mapping, the geographical, cultural and military information in Central Asia is gradually enriched. Third, this period coincided with the first industrial revolution. Russia lacks a good sea port, so it is difficult to participate in overseas colonial competition, and it can only look at the inland of Asia. Fourth, the hinterland of Central Asia, far from the coastline, is not the traditional sphere of influence of European powers.

Subsequently, the Central Asian countries surrendered to the Russian army, leaving only one Afghanistan between Russia and India. However, Russia did not choose to storm, but hoped to win over through alliance. Britain can't tolerate Russia's alliance with Afghanistan, which is tantamount to opening India's door to Russia, so Britain invaded Afghanistan flagrantly. However, Russia did not turn against Britain for Afghanistan, but chose to wait and see. In the end, due to the rise of Germany, Britain and Russia turned from confrontation to cooperation, and this great game that lasted for a hundred years was also put on hold.