Back when I played Raven guard, my opponent had two vindicators on his back line which were set to shell the hell out of my vanguards. He also had a 10 man devastator squad nestled between the two to avoid their rear armour being exposed (They were kind of in a T shape)
Anyways, after much movement and a lot of my army being out of range, I declare I am shooting with a scout squad (all armed with snipers, no rockets). Only one is in range, and it's a regular guy (so BS 3, not 4). He shoots, hits, rends and then gets another 6 for the penetrating hit. Gets a 6" "Explodes!" result and wipes out half the devastator squad (and possibly a few more guys, I can't remember.) Needless to say, my opponent was not impressed, especially when the second vindicator died a turn later.
He was the only scout I was ever bothered enough to paint...
Epic. Way to go, scout! You ought to promote him to full Battle Brother for that one, give him some power armor and let him work his way up the ranks.
Back when I was an active BA player, I once deep-struck a unit of vanilla termies. They scattered onto difficult terrain. Four of the five, including the sergeant, failed their dangerous terrain tests. Following a round of ineffective shooting with his storm bolter, the lone surviving termie was subsequently charged by Commissar Yarrick. This is back in 3rd edition when Yarrick was the bane of all things, keep in mind. Reduced to initiative 1 by their power fists, the commissar and the terminator had a miniature slugging match. Somehow, the lone terminator managed to kill Yarrick and sent the rest of the squad packing.
Moreover, he got locked in combat with a guard infantry squad the next turn and remained that way for the rest of the game.
I moved on from BA recently, but when I renovate that army, I'm promoting that terminator to Captain.