The answer is probably elephants. Can you include the full question next time please.
The advance of Alexander the great's army was stopped by Porus, at the Hydaspes river or<em> the Jhelum river.</em>
Alexander the Great was, stopped by Porus at the banks of Hydaspes river , today named as Jhelum river in Punjab. The battle is popularly known as, "the battle of Hydaspes".
In this battle, Porus was defeated by the armies of Alexander and were destroyed to a higher extent, but his valor had impressed Alexander, and was reinstated as a sub-ordinate ruler under the empire of Alexander.
Historians had marked this battle as an important event of the world history, where the political and cultural values of the<em> Greek cultures came into contact with the culture of Indian sub-continent.</em>
To know more about, Alexander's advances, <em>click here-</em>
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<span>They had civil wars supported by foreign countries.</span>
Mussolini's government has really changed the country, and Italy took part in the first world war. In 1920s there were also climate changes.
