~October to December 1941 (Transpacific War, North American Theatre): Autumn leaves fall
October 1941: The first RDF stations are established to protect the east coast cities. They immediately become a priority target for CW aircraft and regardless the Aircraft Observation Corps remains a far more effective early warning system.
October 1941: Having successfully pushed US forces back beyond their start points, even penetrating into New York state, and with casualties mounting, General Cook ends his counter offensive bring the Battle of Montreal to a close. The battle has resulted in 140,000 US and 100,000 CW casualties. With winter setting in, both sides begin shelling the St Lawrence with heavy railway guns to prevent attempts to cross the ice.
October 1941: The first Sikorsky Hummingbird helicopters are delivered to Canada. They will prove to be far more effective than the gyrodynes previously employed.
October 1941: As US submarine losses have been mounting, considerable numbers of submarines from the Caribbean are redeployed to the Atlantic. This new deployment will actually increase the US submarine strength in the Atlantic above its pre war level. However, even with this increase in strength, US submarines are still unable to inflict appreciable losses on the CW convoys.
October 1941: With bomber losses to CW fighters continuing to mount, the USAF calls for the design of an airlaunched cruise missile to allow stand off attacks.
October 1941: US and CW clash on Lake Ontario as the US attempts to gain naval superiority for an amphibious assault on Toronto. The Battle of the Bass Islands is inconclusive with neither side gaining control of the lake.
November 1942: While the M3 General Lee has proved an effective tank, operations have highlighted numerous problems, noticably its high silhouette and inability to take a hull down position. With it clear a new generation of CW tanks are under design, the US and Japanese begin the development of a new tank to replace it.
November 1941: The escort carrier Laconia covering the CW convoy HC33 is sunk by the US submarine Tuna, allowing US submarines to cause appreciable losses on the convoy. This victory causes a considerable rise in the morale of the US submarine force.
November 1941: The USAF finally diverts aircraft from the strategic bombing role to attack CW airfields. However the airfields now feature considerable anti aircraft defences and losses are heavy.
November 1941: With production of the Panzer IV for the Warsaw Pact starting and their own Crusader still at least a year from production, the CW abandon work on the Crusader, adopting the Panzer IV as the Cavalier. With work on the Crusader halted, the development of a new tank based on the Crusader but armed with a reduced charge version of the 17pdr anti tank gun as the Comet is begun.
November 1941: Relentless pressure finally allows Bradley's forces to secure Squamish, finally isolating the British Colombian interior. However with winter beginning to set in, Bradley calls a halt to operations until spring. Despite the limited nature of Bradley's success, the victory provides the US with a considerable morale boost. Bradley also begins training his remaining divisions in mountain warfare.
December 1941: The CW begins developing new armoured assault vehicles based on the Churchill chassis to replace the existing vehicles based on the Matilda. While the 5.3" conventional mortar is retained on some vehicles, a larger 6.5" petard mortar is also introduced. While a new bridgelayer based on the Churchill is to be developed, the existing Coventeer bridgelayer is to be retained by cruiser armoured units.
December 1941: Nimitz reviews his submarine strategy. With it clearly evident the CW Atlantic convoys escort screens are too strong to be penetrated, he prepares to withdraw the bulk of his submarine force to instead concentrate on CW shipping in South Atlantic and on the Gibraltar to Southampton route. As the vast majority of long range US boats are in the Pacific the US begins planning Operation Youngman to bring 60 long range boats from the Pacific to the Atlantic through the CW dominated South Atlantic.
December 1941: A CW Beaufighter night fighter crash lands over US held territory. The US are able to recover its AI Mk IV airborne RDF set. The capture of this set will lead to a major improvement in US RDF technology.
December 1941: With the situation in Canada stable but aware the US is raising a large number of new formations, 36 extra divisions are allocated to its defence. These divisions begin arriving in Canada at the rate of one division per week.
December 1941: With the need for light automatic weapons growing and the existing M1928A1 Thompson SMG proving prohibitively expensive and still using the old 0.45" ACP, the US begins production of an unlicensed copy of the CW Sten SMG in 9mm Parabellum as the M1 SMG.
December 1941: The Bell P-59 Aerocomet, the first operational jet fighter enters service with the USAF. Its performance will prove disappointing, outmatched by CW Mustangs and Whirlwind. As result only 600 out of the order for 2,000 will be produced.