1968 – California pitchers plunk Baltimore batters three times in the 7th inning at Memorial Stadium, tying the American League record for hit batsmen in one inning. Baltimore wins, 3 – 0.

This Day In Baseball

On August 9, 1968 — 1968 – California pitchers plunk Baltimore batters three times in the 7th inning at Memorial Stadium, tying the American League record for hit batsmen in one inning. Baltimore wins, 3 – 0.

Source:
Baseball Reference August 9
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game