Question on: WAEC Literature - 2017

Iago:    Mere prattle without practice
         Is all his soldiership, But he, Sir had the election;
         And I, of whom his eyes had seen the proof
         At Rhodes, at Cyprus, and on other grounds
         .....must be belee'd and calmed
         By debitor and creditor

(Act 1, Scene One, Lines 23-28)

His soldiership refers to______________