John, Please read the entire OTL tale in context rather than just snipping out the bits that make you feel good. IIRC the minesweepers Condor & Crossbill were out doing their nightly sweep of the PH entrance channel when Condor spotted what they thought was a submarine following them up the channel. Ward was called inshore, off of her "patrol box" route, to check it out with sonar but found nothing. Later on, the cargo vessel USS Antares noticed a minisub trying to follow her as she approached the PH entrance channel. Ward was again called over and with the aid of a PBY overhead made gun and depth charge attacks on it at 0645 that (as we know from the 2002 finding of it's wreckage) resulted in it's sinking. It was the OTL attempts of the IJN minisubs to get thru the nightly closed nets (by very closely following US ships thru) that caused the Ward to abandon it's routine 15 knot "patrol box" further out to sea and move inshore at 5 knots for sonar searches. In my ATL, the IJN minisubs would NOT be trying to sneak into PH thru the nets at all since they would be carefully closing in on the USS Ward instead. Without any OTL sub contacts to check out, that lone gateguard DD would have stayed on it's routine "patrol box" route, as ordered.