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:
Sino-Tibetan_relations_during_the_Ming_dynasty

Context:
When the Dzungar Mongols attempted to spread their territory from what is now Xinjiang into Tibet, the Kangxi Emperor (r. 1661–1722) responded to Tibetan pleas for aid with his own expedition to Tibet, occupying Lhasa in 1720. By 1751, during the reign of the Qianlong Emperor (r. 1735–1796), a protectorate and permanent Qing dynasty garrison was established in Tibet. As of 1751, Albert Kolb writes that "Chinese claims to suzerainty over Tibet date from this time."

Question:
Who tried to spread their territory into Tibet?

the Dzungar Mongols