psychological warfare

— Li also inspected a psychological warfare unit at Huchingtou, Liehyu, where he saw off a balloon carrying materials showing the free bastion of Taiwan's warm support for the pro-democracy movement on the China mainland.

— Bill Tilden invented tennis as we now know it. He changed it from the gentlemanly pastime of the 1920s into a professional sport involving stars, strategies and large amounts of money, from a dull and predictable game into a tactical enterprise involving strategy and psychological warfare, net shots, scoops and lobs, all calculated to throw opponents off balance.