Arthashastra
उपजापो अपसर्पश् च वामनं पर्युपासनम् । अवमर्दश् च पञ्च एते दुर्ग लम्भस्य हेतवः ॥
Intrigue, spies, winning over the enemy's people, siege, and assault are the five means to capture a fort.
english translation
upajApo apasarpaz ca vAmanaM paryupAsanam । avamardaz ca paJca ete durga lambhasya hetavaH ॥
hk transliteration by Sanscript