One of Alexander the Great's bad military accomplishments was his failed invasion of India. After conquering much of the Persian Empire, Alexander turned his sights eastward and led his army across the Hindu Kush mountains into northern India in 327 BC. However, his campaign was met with fierce resistance from Indian kingdoms, and his troops suffered heavy losses from battles, disease, and harsh terrain. Despite winning some notable victories, including the Battle of the Hydaspes River against King Porus, Alexander's army was eventually forced to turn back due to lack of supplies and mounting casualties. The campaign in India drained Alexander's resources and manpower and weakened his hold on his conquered territories, leading some of his officers to mutiny and demand to return home.