After securing the majority of eastern Persia and defeating a major Mongol king, Tokhtamysh, Tamerlane and his army occupied Moscow for a year. During his time of absence from Persia, major revolts broke out. So he repressed them. Knowing his home territory of Samarkand was being handled by his military forces, Tamerlane then attacked India. He crossed the Indus River in 1398 and marched his army into Delhi where he reduced much of the city, an event that would cause a great setback for the region. As a result of this conquest, he left the territory with an immense quantity of spoil, using 90 captured elephants to carry treasure and stones from quarries to erect a mosque in his homeland.