Those were a couple of very interesting articles regarding artillery (and tanks) in the British context and they really got me to thinking.
I think we should assume that Russia is smart enough that it would not give NATO enough time to mobilize it's forces and ship reinforcements from the US, Britain and Canada to Europe in advance of any attack. If they make a military move it's likely to be a quick surprise attack where they feel they have local superiority and can gain their objectives before NATO can react and hopefully present their victory as a fait accompli like in Crimea. That would force NATO to make the decision of all out war between NATO and Russia (with potential nuclear consequences) or acceptance of the new situation.
In a Canadian context what would that mean for deployment of forces to counter such an attack? Assuming we'd need whatever forces we deploy to get there as quickly as possible, what would our most useful response be?
How long would it take to get a Brigade Group into theatre? With only 5 x C-177's in the RCAF I think we'd have to assume that the vast bulk of our forces would have to deploy by ship. Then they'd have to transit from the safe port to the conflict zone (with rail or road transporters for the Leopards and SPGs were we to get them?).
Hypothetically though, what if the Reserves were to be equipped with HIMARS? Two could be loaded on a C-177 (x 5) and one on a C-130J (x 17). That means that a full Regiment of 24 x HIMARS could be airlifted to Europe in a single surge. Being wheeled, they could self-deploy to the conflict zone and could plug into the US logistics infrastructure for supply of munitions (i.e. directly reinforcing a US Army Fires Brigade). They could be used by the higher levels of NATO command to perform counter-battery fire against Russian artillery assets (helping eliminate one of the Russian Army's primary strengths) and hit other high value targets with the goal of slowing a Russian advance and giving time for heavier NATO forces to deploy.
This could be a case where having the right asset available at the right time might be better than the best asset at the wrong time. Like the "Tanks or Indirect Fires?" article says, it's not a case of artillery being better than tanks, but that in our specific context HIMARS for the Reserves might be more effective (in particular circumstances) than tanks or SPGs, or M577's or Hawkeyes.