Bremer served twice as commander-in-chief of British forces in the First Anglo-Chinese War from 1839 to 1841. During the war, he took formal possession of Hong Kong Island for the United Kingdom in 1841. He was made a KCB the same year. In 1846, he was appointed with Sir Francis Augustus Collier to the joint command of the Channel Squadron and became commodore-superintendent of Woolwich Dockyard from which he retired in 1848. He died in 1850, having risen to the rank of rear-admiral.