July 24th - Canadian destroyer St. Croix, with the Canadian C2 group escorting UK/North America convoy ON115, sinks U-90 off Newfoundland.
July 31st - In mid-Atlantic, Canadian destroyer Skeena and corvette Wetaskiwan of the C3 group sink U-588.
Aug HMCS Oakville forces a U-Boat to surface. The submarine is too close for the ship's guns to fire at it, so the Canadian crew mans their boats and board the U-Boat!
Here are two WW2 film clips on escorts fighting U-Boats:
U-Boat attacked (1940) 1:09
Sinking a U-Boat (1943) 1:25