You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Genghis_Khan

Context:
With such a small force, the invading Mongols were forced to change strategies and resort to inciting internal revolt among Kuchlug's supporters, leaving the Qara Khitai more vulnerable to Mongol conquest. As a result, Kuchlug's army was defeated west of Kashgar. Kuchlug fled again, but was soon hunted down by Jebe's army and executed. By 1218, as a result of defeat of Qara Khitai, the Mongol Empire and its control extended as far west as Lake Balkhash, which bordered the Khwarezmia (Khwarezmid Empire), a Muslim state that reached the Caspian Sea to the west and Persian Gulf and the Arabian Sea to the south.

Question:
What strategy did Jebe's army use against Kuchlug and his supporters?

inciting internal revolt