On 28 June, during the British expedition to Tibet, Brigadier-General Macdonald, who had just arrived that day, concluded that Tsechen, which guarded the rear of the Gyantse Dzong, would have to be cleared before the assault of Gyantse Dzong could begin. Shortly before sunset, that same day, the nearby "seemingly impregnable" Tsechen Monastery and Dzong was stormed, after a heavy bombardment by the British ten-pound cannon.