Text: During the reign of his son, under a regent, the borders were pushed further north and west, provoking reactions from the Tibetans and Chinese as well as the British East India Company, the power to the south.
Entailment: The borders were pushed further west and north under the reign of his song,  under a regent, and that provoked reactions from the Tibetans and Chinese as well as the British East India Company, the power to the south.
Contradiction: During the reign of his son,  the borders were pushed back into the territory of the country, and there were no reactions from surrounding countries.