One other factor that might have also lead to their success may have been the Americans underestimating them
I.e. that it was just the Mexican Army how hard can they be?
Very hard to quantify that for us with what we are doing but if the writers took that approach you could see them figuring the US units would be too confident and approach a fight without really considering that the Mexican Army might be better equipped and motivated than they gave them credit
If you look at Trial by Fire (the book I mentioned earlier) the US units feel that way when they encounter Mexican units - and as a result take much heavier casualties than anyone expected
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