A breakout through the River Plate would restrict Admiral Graf Spee's maneuvering and could leave only her forward turret usable while she came out. HMS Cumberland added an upgraded, full-sized County-class heavy cruiser to the opposing force. The comparison with Exeter emphasizes Cumberland's two additional 8-inch guns and the greater weight of fire they could bring. Those guns would make a substantial difference against a ship emerging through a confined approach.
Notable Point · 1:12:21-1:13:12
How HMS Cumberland changed Graf Spee's breakout odds
Restricted maneuvering and Cumberland's two additional 8-inch guns would make a Graf Spee breakout more dangerous.