The first tribe they encountered were the Aspasioi tribe of the Kunar Valley, who initiated a fierce battle against Alexander, in which he himself was wounded in the shoulder by a dart. However, the Aspasioi eventually lost and 40,000 people were enslaved. Alexander then continued in a southwestern direction where he encountered the Assakenoi tribe of the Swat & Buner valleys in April 326 BC. The Assakenoi fought bravely and offered stubborn resistance to Alexander and his army in the cities of Ora, Bazira (Barikot) and Massaga. So enraged was Alexander about the resistance put up by the Assakenoi that he killed the entire population of Massaga and reduced its buildings to rubble – similar slaughters followed in Ora. A similar slaughter then followed at Ora, another stronghold of the Assakenoi. The stories of these slaughters reached numerous Assakenians, who began fleeing to Aornos, a hill-fort located between Shangla and Kohistan. Alexander followed close behind their heels and besieged the strategic hill-fort, eventually capturing and destroying the fort and killing everyone inside. The remaining smaller tribes either surrendered or like the Astanenoi tribe of Pushkalavati (Charsadda) were quickly neutralized where 38,000 soldiers and 230,000 oxen were captured by Alexander. Eventually Alexander's smaller force would meet with the larger force which had come through the Khyber Pass met at Attock. With the conquest of Gandhara complete, Alexander switched to strengthening his military supply line, which by now stretched dangerously vulnerable over the Hindu Kush back to Balkh in Bactria.