रथव्यूहेन हस्तिव्यूहो व्याख्यातः ॥ कZ_१०.५.३० ॥
rathavyūhena hastivyūho vyākhyātaḥ
The elephant-array is explained by (analogy to) the chariot-array.
It reduces training burden: once commanders understand the chariot-array logic, they can map the same principles onto elephant deployment.