Hi

I'm at my first career and first patrol(8 december 1941)
I was sent close to the Japanese coasts after sinking 3 fish-boats, I intercepted a convoy 6-8 merchant And 1 Warship , At periscope depth 1800 meters range stopped engine and fired 3 torpedo 1 missed 1 hit And last exploded in advance.
Merchant hited stopped zero speed,
But the whole convoy has continued on its course ,and escort no serched me! he continued in front of the convoy ,now i ask:
is the behavior of the escort normal?
is it because we are just at the beginning of the war?
Thanks