ततः सत्त्रिणः परेषु ग्राहयेयुः ॥ कZ_०९.६.४३ ॥
tataḥ sattriṇaḥ pareṣu grāhayeyuḥ
Thereafter, the infiltrators (sattrin) should be made to secure agents/associates within the enemy side.
To plant or secure collaborators inside the enemy side using infiltrators.