You can get them eventually, but I don't see much point in it aside from the Rose Strap and maybe being a completionist. You'll probably never see the stronghold battles again at this point.
Just keep in mind you don't have to win a fight to get points, but you're certainly better off on targeting locations with high fortifications and potential NPC defenders just to avoid short battles. Remember, progress in Campaign is entirely time-based by the minute, no more and no less. Generally speaking, you'll want to cycle tags every 10-15 minutes depending on how many categories you can contribute with on your job. Unfortunately, the 5 day evaluation period still exists, so there's no shortcut to the top-rank stuff. But a little persistence will get you there eventually.
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Violence good. Sexy bad. Yay America.