Sow Distrust, and Profit
Time for our next stratagem, the 反間計.
It's rather hard to translate the name itself. Literally it's "counter-between". A "between" is what foreign agents were called in ancient China. Half spies, half agents to sow discord in the enemy ranks.
Original text and translation follows:
疑中之疑比之自內不自失也
Doubts inside doubts. Befriend from the inside, you won't lose.
間者使敵自相疑忌也 反間者因敵之間而間之也
Secret agents [lit. "betweens"] spread doubt within you...