Kenoyer (1991b) sums up the situation: "Any military conquest that would have been effective over such a large area should have left some clear evide… - Jonathan Mark Kenoyer

Episodes of aggression and conflict probably occurred, but armed conflict was not a major activity, nor does the integration of the Indus Valley seem to have been achieved through military coercion.

In the east, the ancient Saraswati (or Ghaggar-Hakra) river ran parallel to the Indus . . . Towards the end of the Indus Valley civilization, the ancient Saraswati had totally dried up and its original tributaries were captured by two other mighty rivers . . . The gradual drying up of the Saraswati river is an event documented both geologically as well as in the sacred Vedic and Brahmanical literature of ancient India . . . Many episodes of the Rig-Veda take place along the sacred Saraswati.

During the Harappan Period (Harappa Phase, 2600…1900 BC) there was a dramatic increase in terracotta cart and wheel types at Harappa and other sites throughout the Indus region. The diversity in carts and wheels, including depictions of what may be spoked wheels, during this period of urban expansion and trade may reflect different functional needs, as well as stylistic and cultural preferences. The unique forms and the early appearance of carts in the Indus valley region suggest that they are the result of indigenous technological development and not diffusion from West Asia or Central Asia as proposed by earlier scholars.