The first two USN DDs to oberve the IJN ships launched torpedoes without opening up with guns. These were pickets, and their attack was entirely consistent with torpedo doctrine. The initial IJN attack was semi-torp doctrine: the initial Type 93 salvo was launched, but the IJN opened up with batteries before the first torps struck. Understandable, given that by *that* time it was clear to the IJN vessels that they'd been spotted. The IJN attack on the northern group was entirely gun-doctrine, despite the availability of half salvos of Type 93s in most of the IJN ships (IIRC, one of them had lost their torp mount to shellfire).
Mate,
I haven't read Frank but I have read several other accounts (both by historians (incl Morison) and also the official USN accounts). Adrian Stewart's 1985 "Guadalcanal : WWII's fiercest naval campaign" is what I use as a constant reference as it is short, concise, references most major texts on the subject and does an excellent job of summarising and analysing the battles.
A few observations on your above quote regarding what I've read on Savo (including the official US Naval Intelligence account).
1) USN DD's Ralph Talbot and Blue were the actual destroyers detached for picket duty. Both reported the Jap scout seaplanes but neither saw Mikawa's ships on the way in (but the IJN saw them and correctly held fire). The Ralph Talbot was spotted again and attacked by the Mikawa's force as they were leaving after the battle (where she fired her 5" guns and 4 torps in response). At no point did these DD's "launch torpedoes without opening up with guns."
2) USN DD's Patterson and Bagley were the screen for the allied Southern force (operating 1500 yds off the port and starboard bow (respectively) of the lead cruiser Canberra. Both spotted Mikawa's force only after the IJN ships had already launched their mass torpedo salvo at the Southern Force. Patterson immeadiately opened fire with her 5" guns (she never fired her torpedoes). Bagley does not appear to have fired her guns but did attempt to fire her torpedoes at the approaching ships. She took so long to prepare that she missed out on the firing solution and had to circle around again to fire them (only launching after Mikawa's ships were withdrawing away from the Southern Group).
3) The intial IJN attack was not "semi-torp" doctrine, it was their standard "torp first" attack (that they trained in for use when they could). Under this attack, gunfire would occur either after the torpedoes hit or at a point where the commander felt that the enemy would have no time left to avoid the torpedo spread. Mikawa's force opened fire only after Patterson attacked (as you said, it was clear to the IJN vessels that they'd been spotted).
4) Regarding the "gunfire" attack by Mikawa against the Northern Group. Japanese accounts refer to 2 reasons. First, due to the dispersion of Mikawa's force into 2 distinct groups (that were still in contact) after the engagement with Southern force, the Japanese choose to illuminate Northern force first with searchlights to clearly establish their identity before firing. These circumstances would not allow the standard "torpedo first" attack.
Secondly, as it was only 15 minutes since the engagement with Southern force, several IJN ships had not finished reloading. Once combat was joined, IJN ships fired their torpedoes as circumstances allowed. 3 to 5 Long Lances struck the USN cruisers.
