हस्ती रथो वा राजवाहनमश्वानुबन्धः ॥ कZ_१०.३.४० ॥
hastī ratho vā rājavāhanam aśvānubandhaḥ
An elephant or a chariot should be the king’s vehicle, with horses kept in attendance as support/backup.
Redundancy and rapid extraction: if the primary vehicle is disabled or terrain changes, horses provide immediate mobility and continuity of command.