The start of World War I compelled the Prince to come back to Thailand in 1914; he was assigned to a teaching post at the Royal Naval Academy. He continued his interest in smaller vessels, including submarines and torpedo boats; this later led to conflict at a meeting, where he was overruled by senior naval officers, most of whom were British graduates and preferred larger vessels. The Prince, feeling that his expertise would never be used, resigned his post nine months after joining the Navy.