Given the question: What type of details about percy w. nelles can be gathered from the following bio? Bio: percy walker nelles , cb -lrb- 7 january 1892 -- 13 july 1951 -rrb- was a flag officer in the royal canadian navy -lrb- rcn -rrb- and the chief of the naval staff from 1934 to 1944 . he oversaw the massive wartime expansion of the rcn and the transformation of canada into a major player in the battle of the atlantic . during his tenure u-boats raided the gulf of st. lawrence , canadian northwest atlantic command was created , and the rcn was providing up to 40 % of all escort forces in the north atlantic . his handling of the rcn 's war effort had its opponents however , and he was removed from his post as chief of the naval staff in january 1944 . he was sent to london as overseas naval attache , coordinating the rcn operations for operation overlord . he retired in january 1945 as a full admiral .
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