On the evening of the 29th, more precisely at dawn on the 30th, the 21st Special Mixed Fleet indeed came under attack by Newland torpedo boats.
However, the situation remained within controllable limits.
Thanks to prior preparations, which involved sending out heavy cruisers equipped with radar along with destroyers to patrol 100 kilometers ahead of the main fleet, the torpedo boats were intercepted by the cruisers and destroyers as soon as they attacked, and none managed to break through.
For dealing with torpedo boats, which were the size of mosquitos, high-altitude guns were sufficient.
Of course, in the destroyers of the frontline special mixed fleets, which all entered service after the outbreak of the major conflict, the main guns were 130-millimeter high-altitude guns.
It could be said that the 80-millimeter high-altitude guns installed on heavy cruisers, as well as quad-mounted 40-millimeter machine guns, were the most efficient in combating the torpedo fast boats.