Any effort by Germany is going to take years to see results, as they lacked sufficient u-boat shipyards and trained crews to ramp up production and fleet size quickly.This was stated many times in this discussion, that if Germany would increase number of submarines Britain would respond immediately. This is far from guaranteed. There is good chance that Britain would respond too late or not respond to German build up at all.
Obviously the Lend Lease US Escort carriers & frigates didn't arrive until 1942-1943, however in addition to the 225 British/Canadian Corvettes (Flower class) and 86 British Escort destroyers (Hunt class) there were 360 further ships ordered in the 1939-1942 building programs, the 185 Isles/Tree/Dance class ASW trawlers/minesweepers, and 175 Bangor/Bird class minesweepers/patrol craft. At about 550-600 tons they weren't as suitable for long distance Ocean escort, however they were used for coastal ASW work in the North sea, Irish Sea, Channel and Mediterranean. Additionally, a few dozen were sent to the US Eastern seaboard in 1942 to counter the "Drumbeat" offensive.British construction programs for ocean escorts:
1939 war emergency: 16 Destroyers, 36 Escort Destroyers, 60 Corvettes
1940-41: 32 Destroyers, 30 Escort Destroyers, 18 Sloops, 27 Frigates, 25 Corvettes
1941-42: 40 Destroyers, 9 Sloops, 19 Frigates, 3 Corvettes
1942-43: 40 Destroyers, 16 Frigates, 14 Corvettes.
1943-44: 13 Destroyers, 50 Frigates, 17 Corvettes
1944-45: 7 Destroyers
51 Destroyers, 4 Sloops and 20 Frigates were not completed until after the war.
In addition Canada produced 8 Destroyers (4 built in UK) 60 Frigates and 112 Corvettes (15 built in UK)
The US provided via lend lease 38 Escort Carriers, 107 Frigates (8 built in Canada) and 22 Corvettes (7 built in Canada). This in addition to the 50 old Destroyers and 10 Coast Guard Cutters.
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