 The second and third columns, 1,000 men under the command of Colonel Naito and 600 men under the command of Colonel Matsubara, assembled at Haisoankau (Kaisanko) and Taipei respectively.All three columns were to converge on Sankakeng, where it was believed the insurgents were assembling a large force.Yamane’s column set off from Tokoham on 22 July, engaged a force of around 500 insurgents five miles from Sankakeng, and drove them back.