In Shakespeare's Othello, the Duke of Venice calls Othello to an emergency session because Cyprus faces an imminent Ottoman Turkish invasion. The Venetian colony is strategically vital, and the Duke trusts Othello—his most capable general—to lead its defense.
The Turkish fleet is reported approaching; losing Cyprus would be a major blow to Venetian trade and prestige. Othello's military reputation and experience fighting the Ottomans make him the clear choice to command the defense forces.