wuzak
Captain
Only for the first wave. There were Zeros based in the same part of French Indo-China so any thwarting would probably have been short-lived.
But Phillips knew he was being shadowed by an aircraft several hours before the attack actually commenced. As soon as his lookouts spotted the aircraft, he would naturally assume that his position was known and so radio silence was immaterial. Had he done so, there's every likelihood that 453 Sqn at Sembawang, which was designated with the fleet protection role, could have seriously handicapped the initial attack, although my comments about the possibility of subsequent IJNAF attacks with A6M escort also apply.
Shouldn't you guys discuss this topic in its own thread?