Richard McKenna served aboard a Yangtze River gunboat in 1936 but set the novel a decade earlier, during the Nationalist Northern Expedition of 1925–1927, aboard the fictional USS San Pablo, a gunboat left from the Spanish–American War.
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The USS San Pablo described in Richard McKenna's The Sand Pebbles is an example of this class of vessel, serving on the US Navy's Yangtze Patrol.