Sutra 2
सामन्तं सामन्तेन सम्भूय यायात् यदि वा मन्येत पार्ष्णिं मे न ग्रहीष्यति पार्ष्णिग्राहं वारयिष्यति यातव्यं नाभिसरिष्यति बलद्वैगुण्यं मे भविष्यति वीवधासारौ मे प्रवर्तयिष्यति परस्य वारयिष्यति बह्वाबाधे मे पथि कण्टकान्मर्दयिष्यति दुर्गाटव्यपसारेषु दण्डेन चरिष्यति यातव्यमविषह्ये दोषे संधौ वा स्थापयिष्यति लब्धलाभांशो वा शत्रूनन्यान्मे विश्वासयिष्यति इति ॥ कZ_०७.७.०२ ॥
sāmantaṃ sāmantena sambhūya yāyāt yadi vā manyeta pārṣṇiṃ me na grahīṣyati pārṣṇigrāhaṃ vārayiṣyati yātavyaṃ nābhisariṣyati baladvaiguṇyaṃ me bhaviṣyati vīvadhāsārau me pravartayiṣyati parasya vārayiṣyati bahvābādhe me pathi kaṇṭakānmardayiṣyati durgāṭavyapasāreṣu daṇḍena cariṣyati yātavyamaviṣahye doṣe saṃdhau vā sthāpayiṣyati labdhalābhāṃśo vā śatrūnanyānme viśvāsayiṣyati iti
若他判断：“他不会夺取我的后方（pārṣṇi）；他会遏制夺后者（pārṣṇigrāha）；他不会反过来对付我；我的兵力将有效加倍；他会发动或压制袭扰与骚扰；在障碍重重的道路上他会碾碎阻碍；在城堡作战与清林开道等行动中他会以强制之力行事；若出现难以容忍的过失，他将被约束于条约之中；并且在分得利益之后，他会安抚我其他敌人，使其对我生信。”——那么，他就应当与一位边境诸侯王（sāmanta）协同进军，去对抗另一位边境诸侯王。
FAQs
March with a neighboring ally only if he reduces rear-risk, increases effective strength, secures routes, supports coercive operations in difficult terrain, and can be held to treaty discipline.
Because expeditionary campaigns fail when supply lines and the homeland are exposed; controlling rear-threats is a prerequisite to outward expansion.