The British offered freedom to the slaves, if they left their masters. They lied. The British thought that if they could start a mass desertion of slaves, it would cripple the colonist's economy and the colonist would be forced to surrender. Food would be scarce due to no slaves laboring in the fields, planting, harvesting, etc.
The kwando river forms the boundary between Zambia and Zimbabwe.
Answer:
Around 550 BCE, Cyrus II of Persia, who became known as Cyrus the Great, rose in rebellion against the Median Empire, eventually conquering the Medes to create the first Persian Empire, also known as the Achaemenid Empire.