All in this discussion:
I believe there may be some confusion as to the participation in MARKET-GARDEN of a Canadian Para Regt . I have no references showing the Canadians in the order of battle for the 1st Airborne Army. There was the 1st Polish Airborne Brigade that was dropped as reinforcements to 1st British Airborne Division (which contained no Canadian units), it took heavy casualities.
The following is in no way meant to disparage the Canadian Airborne Regiment or the 101st Airborne Division or infantrymen (though they are easy targets for abuse)
An issue reference the Canadian airborne regiment rescuing the 101st at Bastogne: First, who would send a dismounted, light infantry force through two corps worth of German armor and infantry to rescue another mostly dismounted unit.? It would never have survived the movement cross country . The northern side of the Bulge was the Germans strongest. Second, if they were airdropped into Bastogne it would have been another regiment to feed, arm, etc. (The weather did not clear sufficiently for airdrops till 23/24 DEC) As DJ stated they were not tactically supportable by an already overstressed supply system inside Bastogne. To me it sounds like another Montgomery blast that the British Army won the Ardennes battle. Patton's 3rd Army was used because they were available, ready and closest to Bastogne. Patton already had a contingency plan sitting on the shelf (there being no personal computers in 1944

) and was able to rapidly redirect two full corps to head north into the weakest part of the German penetration. (His Lorraine Campaign had bogged down, literallly due to wet weather, so he could afford to switch the direction of his attack ---audacity, audacity, always audacity---) On top of that the 3rd Army had the strength to then hold open the road so that supplies could enter and casualities could be evacuated, something a single regiment (regardless of whose army) could never do. Bastogne was not completely cutoff until night of 19 DEC and was relieved on 26 DEC.
There was also a belief among many under educated (military history wise) members of the U.S. airborne community that the 82nd & 101st ABN DIVs saved the Battle of the Bulge and that the tankers, etc, were losing the battle. There was a letter to the editor from a lieutenant in the 82nd Airborne in "Infantry" magazine (back in late 70s, early 80's) that declared that the airborne divisions had to save the 9th & 10th Armored Divisions in the battle. He obviously never expected the frontal attack he ended up receiving in the next months issue, from both the armor and infantry community.
The biggest myth of the battle for Bastogne is: "The 101st (don't kill me now, I served in the 101st from 1992-1995) single-handily defeated the massed German onslaught (of course the 101st makes no efforts to dissaude anyone of that myth

). The facts are quite different, if you look at the order of battle inside the pocket:
101st Airborne Division (+) (at nearly full strength after recovery from MARKET-GARDEN)
.....501st Para Regt
.....502nd Para Regt
.....327th Glider Inf Regt (3rd Battalion was actually the 1st BN, 401st Glider Infantry)
.....321st Glider FA BN (75mm Pack How)
.....907th Glider FA BN (105mm Pack How, I believe)
.....377th Para FA BN (75mm Pack How)
.....463rd Para FA BN (75mm Pack How)
.....81st ABN AAA BN (Primarily trailer-mounted quad-50s)
.....326th ABN ENGR BN
CCB, 10th Armor DIV (COL Roberts later gathered all non-arty stragglers into Team SNAFU)
.....3rd Tank BN (- company C)
.....Co C, 21st Tank BN
.....54th Armd INF BN (- A & C Cos)
.....20th Armd INF BN (-Co C)
......Co C, 609th TD BN
......Co C, 55th Armd Engr BN
......420th Armd FA BN (105mm, M7 Priests)
......Batt B, 796th AAA BN (truck mounted quad-50s & truck-mounted 37mm/50 cal combo mounts) - highly effective against maased dismounted infantry!!!!!!
......Trp D, 90th Recon Sqdn
705th TD BN (36 M10 TDs)
755th FA BN (155mm)
Co C, 9th Armd Engrs
969th FA BN (155mm)
CCR, 9th Armd DIV (Probably 40 serviceable tanks, M4 Sherman & M5 Suart between CCR/9th & CCB/10th) (Sorry I do not have CCRs OB)
Within the Bastogne pocket were over 100 pieces of field artillery, everyone, except the Priests (which were kept mobile) were dug in with 360-degree fields of fire. The mobile AAA-units were used against dismounted attacks by the 326th Volksgrenadiers & others.
The basic anti-armor defense was to have the three airborne/glider regimants and TF SNAFU dig-in an strip away the infantry support. The German armor would continue inside the perimeter where the TDs and tanks would fire from positions on teh backside of the wooded areas and small villages into the rear of the panzer formations, while the dug-in artillery provided anti-support from their holes (a direct 105mm or 155mm arty shell, even HE could do great damage to a 1944 Panter or Mk IV). The Armor and infantry teams would then clean-up stragglers and restore the perimeter. It worked well, the biggest problem being the supply of ammunition and fuel.
Sorry for the diatribe, but the Ardennes Campaign is my favorite ETO battle