Battle of Hiroshima?
Battle of Midway.

Originally Posted by Marc_St_Hilaire

I think there was a bit more to it than that!

The key part in your sentance is 'the diminishing numbers of U Boats'. The turning point in the Battle of the Atlantic was the convoy battles around convoys HX229 and SC122 in March 1943. The Royal Navy progessively got the upper hand from that point on and the U Boats never again inflicted the kind of losses they had prior to this. This was due to a number of factors such as more available escort vessels, better escort vessels, the refinement of Radio Direction Finding, increased availibilty of aircover, better radar, better tactics.............

On a pedantic point, It was not just and only the Royal Navy, but also the Royal Canadian Navy and to some extent the US Navy, and possibly the US Coastguards, not forgetting elements of Coastal Command and Allied Air Forces.

Originally Posted by Onetap

Battle of Hiroshima?
Battle of Midway.

Hiroshima wasn't really a Battle just a very loud bang. Midway however was probably the turning point in the Pacifc. The sinking of Four Carriers belonging to a Nation with limited resources meant the Japs were in the dog doo from then on

Originally Posted by Onetap

Battle of Hiroshima?
Battle of Midway.

Ummm, Hiroshima was more a flash in the pan than a battle.

2 biggest turning points - Arras counter-attack and Hitler deciding to make the attack on Russia a war of annihilation instead of a war of liberation for the western socialist republics.

Ther appointment of Harris and the first Thousand Bomber Raids.
Then of course the "your gonna get your fucking head kicked in" bombing and firestorm at Hamburg.
Truely did stop some of the German Higher Command in their tracks
Folowed by Mosquitoes and Mustangs over Berlin.

Battle of Milne Bay - first time the Imperial Japanese Army was stopped by an opposing force.

Battle of Milne Bay | Australian War Memorial

Battle of the Coral Sea - Imperial Japanese Navy recieves heavy losses, thereby, reducing any further force projection.

Encyclopedia | Australian War Memorial

It would have been interesting to see what would have happened had the Germany won the Battle of the Bulge.
It certainly wouldn't have turned the whole war around but it could've had a large impact of the Allies war in Europe.

Originally Posted by velcrostripes

Very good point. We ( well Philby , Cairncross , et al ) were able to keep Stalin informed of every German move on the Eastern Front thanks to Ultra / Enigma intercepts , so whatever the Germans did they were eventually going to lose .

I think you may be overestimating the importance of Enigma in the USSR's victory on the Eastern Front - not saying it was of no use whatsoever, but how timely was the supply from Philby & Cairncross and well did the Sovs use it?.

More generally WW2 British Sigint seems have acquired an almost mythological status - it's interesting to read stuff like this

Decoding history: the Battle of the Atlantic and Ultra / W.J.R. Gardner ... - W. J. R. Gardner - Google Books

where the author tries to place Ultra's contribution in the wider context of the operational and tactical realities of ASW in the North Atlantic.

Originally Posted by Charm_City

I think you may be overestimating the importance of Enigma in the USSR's victory on the Eastern Front - not saying it was of no use whatsoever, but how timely was the supply from Philby & Cairncross and well did the Sovs use it?.

More generally WW2 British Sigint seems have acquired an almost mythological status - it's interesting to read stuff like this

Decoding history: the Battle of the Atlantic and Ultra / W.J.R. Gardner ... - W. J. R. Gardner - Google Books

where the author tries to place Ultra's contribution in the wider context of the operational and tactical realities of ASW in the North Atlantic.

The Soviets also knew German intentions from spies and partisans in the German rear areas , plus air recconnaisance so their intel was up to date .