[Legbreaker]

I had the 2nd crawl very slowly west to link up with the following units of the XI Corp. One of the conrtibuting reasons why the 3rd army did not follow on was that the vehicle heavy 2nd, which at the time was in a stragegically advanced position, soaked up most of the available fuel stocks. This both made them semi-mobile once more while also impacting heavily on the unit which had to give up their reserves.
This drain was particularly heavy on the 50th AD - the nearest allied unit to the Marines.

You could explain the Canadians and Danish being in the area by assigning them the duty of escorting the gathered fuel. They then took up covering positions while the Marines refueled and reorganised (the crawl westward would have sevrely disorganised them as some component units were able to move quicker than others).
There is no real need for all of the Canadian and Danish strength to be shifted though, the bulk could well remain where they were facing the Poles and Soviets.

Why didn't the Germans leapfrog the XI Corp? I'm guessing fuel once again (as well as increasing pressure on the British). With the Marines requiring something like several million litres, every unit needed to give up subtantial percentages of their reserve or risk the Marines being attack while immobile and destroyed. Note this was before the 5th even got close to Lodz.
I feel there is a strong chance that at this relatively early stage, the 5th and 8th were probably still in physical contact with the XI Corp and therefore would also have lost fuel reserves to the Marines. This may help expain why a division which had spent a year or more in preperation had needed to stoip and brew more fuel along the way.