One of the greatest challenges facing international arbitration is the employment of deliberate efforts to obstruct, delay, derail, or sabotage arbitral proceedings, commonly referred to as “guerrilla tactics”. Tribunals may be best positioned to deter such conduct through the issuance of interim cost awards. The world’s leading arbitral institutions, as well as the leading guidelines for arbitrators, invest arbitrators with ample authority to impose such awards. By clearly laying out ground rules and expectations at the outset of an arbitration with respect to interim cost awards as a response to guerrilla tactics, proactive arbitrators can further strengthen their authority to issue such awards, and perhaps even reduce the likelihood that they will need to do so.