He attempted to repeat his father's success in India, but his attempts at expansion brought him into conflict with the British. The British induced the Shah of Persia to invade Durrani, thwarting his plans by forcing him to protect his own lands.
In his own lands, things went well for Zaman, at least initially. He was able to force Mahmud from Herat and into a Persian exile. However, Mahmud established an alliance with Fateh Khan, with whose support he was able to strike back in 1800, and Zaman had to flee toward Peshawar. But he never made it--on the way, he was captured, blinded and imprisoned in Kabul, in the Bala Hissar. Little information about the rest of his life is available, but he was probably imprisoned for nearly 40 years, until his death, during which time Afghanistan continued to experience much political turmoil.