 Although the king's three sons were viceroys of the nearby Lower Burma cities (in Bassein (Pathein), Prome (Pyay), and Dala), the king, preoccupied with much more serious threat in the north, did not (or could not) take any action on Martaban.Throughout 1282, the Mongol command made preparations for the upcoming invasions of Champa and northern Burma.The objective of the Burma campaign was to take over northern Burma but no further; the emperor did not sanction an attack on Pagan itself.