packed 2 20mm cannon and came into service in late 1940. I assume that their protest pre-dated that, but the design had been in process for 2 years so this was probably a pre-emptive manoeuver on their part. Besides, since Japan's primary ally Germany pioneered the use of cannon in aircraft...
which was roughly to deck level. There are photos and film from an aircraft of the sunken listing ship. The Brits jumped aboard and immediately checked out the Admiral Graf Spee's gun laying radar which was found to be more accurate and of longer range than the Brit's own. (Germans did and do...