Guy Sullivan, 43, admitted a charge of violent disorder relating to the incident during protests in the Devon city on August 5.
Plymouth Crown Court heard the lone officer was up against a grass verge and was using his baton to strike forward in a bid to push back protesters around him.
Sullivan, of New George Street, Plymouth, then came behind the officer and grabbed the baton out of his hands. The officer was pulled to the ground and attacked by other protesters as onlookers filmed and shouted "get him', "do him" and "let him have it".
Judge Robert Linford told Sullivan: "You ran up behind Pc Hannaford, who was doing what he could to try to keep the mob, because that's what they were, at bay.
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