Completed the following sentence: The gardens suffered damage numerous times during the 19th century. During the First Opium War, the British army used the Huxinting Teahouse as a base of operations for several days in 1842.<unk> During the First Opium War, the British army used the Huxinting Teahouse as a base of operations for several days in 1842. <unk> <unk> <unk> <unk>
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