 In November 1125 Taizong ordered his armies to attack the Song . The defection of Zhang Jue two years earlier served as the casus belli . Two armies were sent to capture the major cities of the Song . 
 In November 1125 Taizong ordered his armies to attack the Song . The defection of Zhang Jue two years earlier served as the casus belli . Two armies <a href='uninflect' title='1'><mark>were</mark></a> sent to capture the major cities of the Song . 
In November 1125 Taizong ordered his armies to attack the Song . The defection of Zhang Jue two years earlier served as da casus belli . Two armies was sent to capture the major cities of tdaSong .