two hundred infantry and four tanks is basically a regiment sized force by 2000 (for a comparison look at what left of the 2nd Armored by Nov 2000 - its not that much bigger)
that size force would definitely be able to stand off anything less than a major push by the Canadians or the US for that matter
would the marauders be US, Canadian or Russian or a combo of all three? All of those countries had forces in the area (there are the remnants of two Russian divisions not that far away for instance) and thus the marauders could have orginated from any of them
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